[llvm] [AMDGPU][SIInsertWaitCnts] Gfx12.5 - Refactor xcnt optimization (PR #164357)
Ryan Mitchell via llvm-commits
llvm-commits at lists.llvm.org
Mon Nov 3 13:53:17 PST 2025
https://github.com/RyanRio updated https://github.com/llvm/llvm-project/pull/164357
>From 0f781b659d463b56886dc4fbfc0946560937ee6b Mon Sep 17 00:00:00 2001
From: Ryan Mitchell <Ryan.Mitchell at amd.com>
Date: Thu, 30 Oct 2025 11:39:00 -0700
Subject: [PATCH 1/3] [AMDGPU][SIInsertWaitCnts] Refactor xcnt optimization
Refactor the XCnt optimization checks so that they can be checked when
applying a pre-existing waitcnt. This has the effect of removing
unnecessary xcnt waits when taking a loop backedge.
---
llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp | 53 ++++++++--------
llvm/test/CodeGen/AMDGPU/flat-saddr-load.ll | 6 +-
llvm/test/CodeGen/AMDGPU/fmin3.ll | 2 -
.../CodeGen/AMDGPU/global-atomicrmw-fadd.ll | 60 +++++++------------
.../CodeGen/AMDGPU/llvm.amdgcn.is.shared.ll | 1 -
5 files changed, 51 insertions(+), 71 deletions(-)
diff --git a/llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp b/llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp
index b7fa899678ec7..b6e2c3a7f8950 100644
--- a/llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp
+++ b/llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp
@@ -646,6 +646,8 @@ class WaitcntBrackets {
void applyWaitcnt(const AMDGPU::Waitcnt &Wait);
void applyWaitcnt(InstCounterType T, unsigned Count);
+ bool hasRedundantXCntWithKmCnt(const AMDGPU::Waitcnt &Wait);
+ bool canOptimizeXCntWithLoadCnt(const AMDGPU::Waitcnt &Wait);
void applyXcnt(const AMDGPU::Waitcnt &Wait);
void updateByEvent(WaitEventType E, MachineInstr &MI);
@@ -1287,40 +1289,35 @@ void WaitcntBrackets::applyWaitcnt(InstCounterType T, unsigned Count) {
}
}
-void WaitcntBrackets::applyXcnt(const AMDGPU::Waitcnt &Wait) {
- // On entry to a block with multiple predescessors, there may
- // be pending SMEM and VMEM events active at the same time.
- // In such cases, only clear one active event at a time.
- auto applyPendingXcntGroup = [this](unsigned E) {
- unsigned LowerBound = getScoreLB(X_CNT);
- applyWaitcnt(X_CNT, 0);
- PendingEvents |= (1 << E);
- setScoreLB(X_CNT, LowerBound);
- };
-
+bool WaitcntBrackets::hasRedundantXCntWithKmCnt(const AMDGPU::Waitcnt &Wait) {
// Wait on XCNT is redundant if we are already waiting for a load to complete.
// SMEM can return out of order, so only omit XCNT wait if we are waiting till
// zero.
- if (Wait.KmCnt == 0 && hasPendingEvent(SMEM_GROUP)) {
- if (hasPendingEvent(VMEM_GROUP))
- applyPendingXcntGroup(VMEM_GROUP);
- else
- applyWaitcnt(X_CNT, 0);
- return;
- }
+ return Wait.KmCnt == 0 && hasPendingEvent(SMEM_GROUP);
+}
+bool WaitcntBrackets::canOptimizeXCntWithLoadCnt(const AMDGPU::Waitcnt &Wait) {
// If we have pending store we cannot optimize XCnt because we do not wait for
// stores. VMEM loads retun in order, so if we only have loads XCnt is
// decremented to the same number as LOADCnt.
- if (Wait.LoadCnt != ~0u && hasPendingEvent(VMEM_GROUP) &&
- !hasPendingEvent(STORE_CNT)) {
- if (hasPendingEvent(SMEM_GROUP))
- applyPendingXcntGroup(SMEM_GROUP);
+ return Wait.LoadCnt != ~0u && hasPendingEvent(VMEM_GROUP) &&
+ !hasPendingEvent(STORE_CNT) && !hasPendingEvent(SMEM_GROUP);
+}
+
+void WaitcntBrackets::applyXcnt(const AMDGPU::Waitcnt &Wait) {
+ if (hasRedundantXCntWithKmCnt(Wait)) {
+ if (hasPendingEvent(VMEM_GROUP))
+ // Only clear the SMEM_GROUP event, but VMEM_GROUP could still require handling.
+ PendingEvents &= ~(1 << SMEM_GROUP);
else
- applyWaitcnt(X_CNT, std::min(Wait.XCnt, Wait.LoadCnt));
+ applyWaitcnt(X_CNT, 0);
return;
}
-
+ if (canOptimizeXCntWithLoadCnt(Wait))
+ // On entry to a block with multiple predescessors, there may
+ // be pending SMEM and VMEM events active at the same time.
+ // In such cases, only clear one active event at a time.
+ return applyWaitcnt(X_CNT, std::min(Wait.XCnt, Wait.LoadCnt));
applyWaitcnt(X_CNT, Wait.XCnt);
}
@@ -1656,6 +1653,8 @@ bool WaitcntGeneratorGFX12Plus::applyPreexistingWaitcnt(
}
}
+ // Save the pre combine waitcnt in order to make xcnt checks.
+ AMDGPU::Waitcnt PreCombine = Wait;
if (CombinedLoadDsCntInstr) {
// Only keep an S_WAIT_LOADCNT_DSCNT if both counters actually need
// to be waited for. Otherwise, let the instruction be deleted so
@@ -1746,6 +1745,12 @@ bool WaitcntGeneratorGFX12Plus::applyPreexistingWaitcnt(
}
for (auto CT : inst_counter_types(NUM_EXTENDED_INST_CNTS)) {
+ if ((CT == KM_CNT && ScoreBrackets.hasRedundantXCntWithKmCnt(PreCombine)) ||
+ (CT == LOAD_CNT &&
+ ScoreBrackets.canOptimizeXCntWithLoadCnt(PreCombine)))
+ // Xcnt may need to be updated depending on a pre-existing KM/LOAD_CNT
+ // due to taking the backedge of a block.
+ ScoreBrackets.applyXcnt(PreCombine);
if (!WaitInstrs[CT])
continue;
diff --git a/llvm/test/CodeGen/AMDGPU/flat-saddr-load.ll b/llvm/test/CodeGen/AMDGPU/flat-saddr-load.ll
index 31344c78990b8..f5feeb2f49171 100644
--- a/llvm/test/CodeGen/AMDGPU/flat-saddr-load.ll
+++ b/llvm/test/CodeGen/AMDGPU/flat-saddr-load.ll
@@ -2107,7 +2107,7 @@ define amdgpu_ps void @flat_addr_64bit_lsr_iv(ptr inreg %arg) {
; GFX1250-SDAG-NEXT: s_mov_b64 s[0:1], 0
; GFX1250-SDAG-NEXT: .LBB116_1: ; %bb3
; GFX1250-SDAG-NEXT: ; =>This Inner Loop Header: Depth=1
-; GFX1250-SDAG-NEXT: s_wait_xcnt 0x0
+; GFX1250-SDAG-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
; GFX1250-SDAG-NEXT: s_add_nc_u64 s[4:5], s[2:3], s[0:1]
; GFX1250-SDAG-NEXT: s_add_nc_u64 s[0:1], s[0:1], 4
; GFX1250-SDAG-NEXT: s_wait_dscnt 0x0
@@ -2126,7 +2126,6 @@ define amdgpu_ps void @flat_addr_64bit_lsr_iv(ptr inreg %arg) {
; GFX1250-GISEL-NEXT: .LBB116_1: ; %bb3
; GFX1250-GISEL-NEXT: ; =>This Inner Loop Header: Depth=1
; GFX1250-GISEL-NEXT: s_wait_dscnt 0x0
-; GFX1250-GISEL-NEXT: s_wait_xcnt 0x0
; GFX1250-GISEL-NEXT: s_delay_alu instid0(VALU_DEP_1) | instskip(NEXT) | instid1(VALU_DEP_1)
; GFX1250-GISEL-NEXT: v_add_co_u32 v4, vcc_lo, v0, v2
; GFX1250-GISEL-NEXT: v_add_co_ci_u32_e64 v5, null, v1, v3, vcc_lo
@@ -2162,7 +2161,7 @@ define amdgpu_ps void @flat_addr_64bit_lsr_iv_multiload(ptr inreg %arg, ptr inre
; GFX1250-SDAG-NEXT: s_mov_b64 s[0:1], 0
; GFX1250-SDAG-NEXT: .LBB117_1: ; %bb3
; GFX1250-SDAG-NEXT: ; =>This Inner Loop Header: Depth=1
-; GFX1250-SDAG-NEXT: s_wait_xcnt 0x0
+; GFX1250-SDAG-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
; GFX1250-SDAG-NEXT: s_add_nc_u64 s[4:5], s[2:3], s[0:1]
; GFX1250-SDAG-NEXT: s_add_nc_u64 s[0:1], s[0:1], 4
; GFX1250-SDAG-NEXT: s_wait_dscnt 0x0
@@ -2183,7 +2182,6 @@ define amdgpu_ps void @flat_addr_64bit_lsr_iv_multiload(ptr inreg %arg, ptr inre
; GFX1250-GISEL-NEXT: v_mov_b64_e32 v[2:3], s[0:1]
; GFX1250-GISEL-NEXT: .LBB117_1: ; %bb3
; GFX1250-GISEL-NEXT: ; =>This Inner Loop Header: Depth=1
-; GFX1250-GISEL-NEXT: s_wait_xcnt 0x0
; GFX1250-GISEL-NEXT: s_delay_alu instid0(VALU_DEP_1) | instskip(NEXT) | instid1(VALU_DEP_1)
; GFX1250-GISEL-NEXT: v_add_co_u32 v4, vcc_lo, v0, v2
; GFX1250-GISEL-NEXT: v_add_co_ci_u32_e64 v5, null, v1, v3, vcc_lo
diff --git a/llvm/test/CodeGen/AMDGPU/fmin3.ll b/llvm/test/CodeGen/AMDGPU/fmin3.ll
index 6a6f232c55e24..2756472652bc9 100644
--- a/llvm/test/CodeGen/AMDGPU/fmin3.ll
+++ b/llvm/test/CodeGen/AMDGPU/fmin3.ll
@@ -1233,7 +1233,6 @@ define amdgpu_kernel void @test_fmin3_olt_0_f64(ptr addrspace(1) %out, ptr addrs
; GFX1250-NEXT: s_wait_loadcnt 0x0
; GFX1250-NEXT: buffer_load_b64 v[2:3], off, s[16:19], null scope:SCOPE_SYS
; GFX1250-NEXT: s_wait_loadcnt 0x0
-; GFX1250-NEXT: s_wait_xcnt 0x1
; GFX1250-NEXT: s_mov_b32 s4, s14
; GFX1250-NEXT: s_mov_b32 s5, s15
; GFX1250-NEXT: s_mov_b32 s0, s8
@@ -1443,7 +1442,6 @@ define amdgpu_kernel void @test_fmin3_olt_1_f64(ptr addrspace(1) %out, ptr addrs
; GFX1250-NEXT: s_wait_loadcnt 0x0
; GFX1250-NEXT: buffer_load_b64 v[2:3], off, s[16:19], null scope:SCOPE_SYS
; GFX1250-NEXT: s_wait_loadcnt 0x0
-; GFX1250-NEXT: s_wait_xcnt 0x1
; GFX1250-NEXT: s_mov_b32 s4, s14
; GFX1250-NEXT: s_mov_b32 s5, s15
; GFX1250-NEXT: s_mov_b32 s0, s8
diff --git a/llvm/test/CodeGen/AMDGPU/global-atomicrmw-fadd.ll b/llvm/test/CodeGen/AMDGPU/global-atomicrmw-fadd.ll
index a50791e10f5a2..ed565ca43f9a3 100644
--- a/llvm/test/CodeGen/AMDGPU/global-atomicrmw-fadd.ll
+++ b/llvm/test/CodeGen/AMDGPU/global-atomicrmw-fadd.ll
@@ -8814,7 +8814,7 @@ define half @global_agent_atomic_fadd_ret_f16__amdgpu_no_fine_grained_memory(ptr
; GFX1250-TRUE16-NEXT: global_inv scope:SCOPE_DEV
; GFX1250-TRUE16-NEXT: v_cmp_eq_u32_e32 vcc_lo, v5, v7
; GFX1250-TRUE16-NEXT: s_or_b32 s0, vcc_lo, s0
-; GFX1250-TRUE16-NEXT: s_wait_xcnt 0x0
+; GFX1250-TRUE16-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
; GFX1250-TRUE16-NEXT: s_and_not1_b32 exec_lo, exec_lo, s0
; GFX1250-TRUE16-NEXT: s_cbranch_execnz .LBB44_1
; GFX1250-TRUE16-NEXT: ; %bb.2: ; %atomicrmw.end
@@ -8857,7 +8857,7 @@ define half @global_agent_atomic_fadd_ret_f16__amdgpu_no_fine_grained_memory(ptr
; GFX1250-FAKE16-NEXT: global_inv scope:SCOPE_DEV
; GFX1250-FAKE16-NEXT: v_cmp_eq_u32_e32 vcc_lo, v5, v7
; GFX1250-FAKE16-NEXT: s_or_b32 s0, vcc_lo, s0
-; GFX1250-FAKE16-NEXT: s_wait_xcnt 0x0
+; GFX1250-FAKE16-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
; GFX1250-FAKE16-NEXT: s_and_not1_b32 exec_lo, exec_lo, s0
; GFX1250-FAKE16-NEXT: s_cbranch_execnz .LBB44_1
; GFX1250-FAKE16-NEXT: ; %bb.2: ; %atomicrmw.end
@@ -9322,7 +9322,7 @@ define half @global_agent_atomic_fadd_ret_f16__offset12b_pos__amdgpu_no_fine_gra
; GFX1250-TRUE16-NEXT: global_inv scope:SCOPE_DEV
; GFX1250-TRUE16-NEXT: v_cmp_eq_u32_e32 vcc_lo, v5, v7
; GFX1250-TRUE16-NEXT: s_or_b32 s0, vcc_lo, s0
-; GFX1250-TRUE16-NEXT: s_wait_xcnt 0x0
+; GFX1250-TRUE16-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
; GFX1250-TRUE16-NEXT: s_and_not1_b32 exec_lo, exec_lo, s0
; GFX1250-TRUE16-NEXT: s_cbranch_execnz .LBB45_1
; GFX1250-TRUE16-NEXT: ; %bb.2: ; %atomicrmw.end
@@ -9365,7 +9365,7 @@ define half @global_agent_atomic_fadd_ret_f16__offset12b_pos__amdgpu_no_fine_gra
; GFX1250-FAKE16-NEXT: global_inv scope:SCOPE_DEV
; GFX1250-FAKE16-NEXT: v_cmp_eq_u32_e32 vcc_lo, v5, v7
; GFX1250-FAKE16-NEXT: s_or_b32 s0, vcc_lo, s0
-; GFX1250-FAKE16-NEXT: s_wait_xcnt 0x0
+; GFX1250-FAKE16-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
; GFX1250-FAKE16-NEXT: s_and_not1_b32 exec_lo, exec_lo, s0
; GFX1250-FAKE16-NEXT: s_cbranch_execnz .LBB45_1
; GFX1250-FAKE16-NEXT: ; %bb.2: ; %atomicrmw.end
@@ -9844,7 +9844,7 @@ define half @global_agent_atomic_fadd_ret_f16__offset12b_neg__amdgpu_no_fine_gra
; GFX1250-TRUE16-NEXT: global_inv scope:SCOPE_DEV
; GFX1250-TRUE16-NEXT: v_cmp_eq_u32_e32 vcc_lo, v5, v7
; GFX1250-TRUE16-NEXT: s_or_b32 s0, vcc_lo, s0
-; GFX1250-TRUE16-NEXT: s_wait_xcnt 0x0
+; GFX1250-TRUE16-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
; GFX1250-TRUE16-NEXT: s_and_not1_b32 exec_lo, exec_lo, s0
; GFX1250-TRUE16-NEXT: s_cbranch_execnz .LBB46_1
; GFX1250-TRUE16-NEXT: ; %bb.2: ; %atomicrmw.end
@@ -9888,7 +9888,7 @@ define half @global_agent_atomic_fadd_ret_f16__offset12b_neg__amdgpu_no_fine_gra
; GFX1250-FAKE16-NEXT: global_inv scope:SCOPE_DEV
; GFX1250-FAKE16-NEXT: v_cmp_eq_u32_e32 vcc_lo, v5, v7
; GFX1250-FAKE16-NEXT: s_or_b32 s0, vcc_lo, s0
-; GFX1250-FAKE16-NEXT: s_wait_xcnt 0x0
+; GFX1250-FAKE16-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
; GFX1250-FAKE16-NEXT: s_and_not1_b32 exec_lo, exec_lo, s0
; GFX1250-FAKE16-NEXT: s_cbranch_execnz .LBB46_1
; GFX1250-FAKE16-NEXT: ; %bb.2: ; %atomicrmw.end
@@ -10365,7 +10365,6 @@ define void @global_agent_atomic_fadd_noret_f16__amdgpu_no_fine_grained_memory(p
; GFX1250-TRUE16-NEXT: s_wait_loadcnt 0x0
; GFX1250-TRUE16-NEXT: global_inv scope:SCOPE_DEV
; GFX1250-TRUE16-NEXT: v_cmp_eq_u32_e32 vcc_lo, v4, v5
-; GFX1250-TRUE16-NEXT: s_wait_xcnt 0x0
; GFX1250-TRUE16-NEXT: v_mov_b32_e32 v5, v4
; GFX1250-TRUE16-NEXT: s_or_b32 s0, vcc_lo, s0
; GFX1250-TRUE16-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
@@ -10407,7 +10406,6 @@ define void @global_agent_atomic_fadd_noret_f16__amdgpu_no_fine_grained_memory(p
; GFX1250-FAKE16-NEXT: s_wait_loadcnt 0x0
; GFX1250-FAKE16-NEXT: global_inv scope:SCOPE_DEV
; GFX1250-FAKE16-NEXT: v_cmp_eq_u32_e32 vcc_lo, v4, v5
-; GFX1250-FAKE16-NEXT: s_wait_xcnt 0x0
; GFX1250-FAKE16-NEXT: v_mov_b32_e32 v5, v4
; GFX1250-FAKE16-NEXT: s_or_b32 s0, vcc_lo, s0
; GFX1250-FAKE16-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
@@ -10857,7 +10855,6 @@ define void @global_agent_atomic_fadd_noret_f16__offset12b_pos__amdgpu_no_fine_g
; GFX1250-TRUE16-NEXT: s_wait_loadcnt 0x0
; GFX1250-TRUE16-NEXT: global_inv scope:SCOPE_DEV
; GFX1250-TRUE16-NEXT: v_cmp_eq_u32_e32 vcc_lo, v4, v5
-; GFX1250-TRUE16-NEXT: s_wait_xcnt 0x0
; GFX1250-TRUE16-NEXT: v_mov_b32_e32 v5, v4
; GFX1250-TRUE16-NEXT: s_or_b32 s0, vcc_lo, s0
; GFX1250-TRUE16-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
@@ -10899,7 +10896,6 @@ define void @global_agent_atomic_fadd_noret_f16__offset12b_pos__amdgpu_no_fine_g
; GFX1250-FAKE16-NEXT: s_wait_loadcnt 0x0
; GFX1250-FAKE16-NEXT: global_inv scope:SCOPE_DEV
; GFX1250-FAKE16-NEXT: v_cmp_eq_u32_e32 vcc_lo, v4, v5
-; GFX1250-FAKE16-NEXT: s_wait_xcnt 0x0
; GFX1250-FAKE16-NEXT: v_mov_b32_e32 v5, v4
; GFX1250-FAKE16-NEXT: s_or_b32 s0, vcc_lo, s0
; GFX1250-FAKE16-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
@@ -11363,7 +11359,6 @@ define void @global_agent_atomic_fadd_noret_f16__offset12b_neg__amdgpu_no_fine_g
; GFX1250-TRUE16-NEXT: s_wait_loadcnt 0x0
; GFX1250-TRUE16-NEXT: global_inv scope:SCOPE_DEV
; GFX1250-TRUE16-NEXT: v_cmp_eq_u32_e32 vcc_lo, v4, v5
-; GFX1250-TRUE16-NEXT: s_wait_xcnt 0x0
; GFX1250-TRUE16-NEXT: v_mov_b32_e32 v5, v4
; GFX1250-TRUE16-NEXT: s_or_b32 s0, vcc_lo, s0
; GFX1250-TRUE16-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
@@ -11406,7 +11401,6 @@ define void @global_agent_atomic_fadd_noret_f16__offset12b_neg__amdgpu_no_fine_g
; GFX1250-FAKE16-NEXT: s_wait_loadcnt 0x0
; GFX1250-FAKE16-NEXT: global_inv scope:SCOPE_DEV
; GFX1250-FAKE16-NEXT: v_cmp_eq_u32_e32 vcc_lo, v4, v5
-; GFX1250-FAKE16-NEXT: s_wait_xcnt 0x0
; GFX1250-FAKE16-NEXT: v_mov_b32_e32 v5, v4
; GFX1250-FAKE16-NEXT: s_or_b32 s0, vcc_lo, s0
; GFX1250-FAKE16-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
@@ -11861,7 +11855,7 @@ define half @global_agent_atomic_fadd_ret_f16__offset12b_pos__align4__amdgpu_no_
; GFX1250-TRUE16-NEXT: global_inv scope:SCOPE_DEV
; GFX1250-TRUE16-NEXT: v_cmp_eq_u32_e32 vcc_lo, v3, v5
; GFX1250-TRUE16-NEXT: s_or_b32 s0, vcc_lo, s0
-; GFX1250-TRUE16-NEXT: s_wait_xcnt 0x0
+; GFX1250-TRUE16-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
; GFX1250-TRUE16-NEXT: s_and_not1_b32 exec_lo, exec_lo, s0
; GFX1250-TRUE16-NEXT: s_cbranch_execnz .LBB50_1
; GFX1250-TRUE16-NEXT: ; %bb.2: ; %atomicrmw.end
@@ -11893,7 +11887,7 @@ define half @global_agent_atomic_fadd_ret_f16__offset12b_pos__align4__amdgpu_no_
; GFX1250-FAKE16-NEXT: global_inv scope:SCOPE_DEV
; GFX1250-FAKE16-NEXT: v_cmp_eq_u32_e32 vcc_lo, v3, v5
; GFX1250-FAKE16-NEXT: s_or_b32 s0, vcc_lo, s0
-; GFX1250-FAKE16-NEXT: s_wait_xcnt 0x0
+; GFX1250-FAKE16-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
; GFX1250-FAKE16-NEXT: s_and_not1_b32 exec_lo, exec_lo, s0
; GFX1250-FAKE16-NEXT: s_cbranch_execnz .LBB50_1
; GFX1250-FAKE16-NEXT: ; %bb.2: ; %atomicrmw.end
@@ -12245,7 +12239,6 @@ define void @global_agent_atomic_fadd_noret_f16__offset12b__align4_pos__amdgpu_n
; GFX1250-TRUE16-NEXT: s_wait_loadcnt 0x0
; GFX1250-TRUE16-NEXT: global_inv scope:SCOPE_DEV
; GFX1250-TRUE16-NEXT: v_cmp_eq_u32_e32 vcc_lo, v3, v5
-; GFX1250-TRUE16-NEXT: s_wait_xcnt 0x0
; GFX1250-TRUE16-NEXT: v_mov_b32_e32 v5, v3
; GFX1250-TRUE16-NEXT: s_or_b32 s0, vcc_lo, s0
; GFX1250-TRUE16-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
@@ -12276,7 +12269,6 @@ define void @global_agent_atomic_fadd_noret_f16__offset12b__align4_pos__amdgpu_n
; GFX1250-FAKE16-NEXT: s_wait_loadcnt 0x0
; GFX1250-FAKE16-NEXT: global_inv scope:SCOPE_DEV
; GFX1250-FAKE16-NEXT: v_cmp_eq_u32_e32 vcc_lo, v3, v5
-; GFX1250-FAKE16-NEXT: s_wait_xcnt 0x0
; GFX1250-FAKE16-NEXT: v_mov_b32_e32 v5, v3
; GFX1250-FAKE16-NEXT: s_or_b32 s0, vcc_lo, s0
; GFX1250-FAKE16-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
@@ -12631,7 +12623,7 @@ define half @global_system_atomic_fadd_ret_f16__offset12b_pos__amdgpu_no_fine_gr
; GFX1250-TRUE16-NEXT: global_inv scope:SCOPE_SYS
; GFX1250-TRUE16-NEXT: v_cmp_eq_u32_e32 vcc_lo, v5, v7
; GFX1250-TRUE16-NEXT: s_or_b32 s0, vcc_lo, s0
-; GFX1250-TRUE16-NEXT: s_wait_xcnt 0x0
+; GFX1250-TRUE16-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
; GFX1250-TRUE16-NEXT: s_and_not1_b32 exec_lo, exec_lo, s0
; GFX1250-TRUE16-NEXT: s_cbranch_execnz .LBB52_1
; GFX1250-TRUE16-NEXT: ; %bb.2: ; %atomicrmw.end
@@ -12674,7 +12666,7 @@ define half @global_system_atomic_fadd_ret_f16__offset12b_pos__amdgpu_no_fine_gr
; GFX1250-FAKE16-NEXT: global_inv scope:SCOPE_SYS
; GFX1250-FAKE16-NEXT: v_cmp_eq_u32_e32 vcc_lo, v5, v7
; GFX1250-FAKE16-NEXT: s_or_b32 s0, vcc_lo, s0
-; GFX1250-FAKE16-NEXT: s_wait_xcnt 0x0
+; GFX1250-FAKE16-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
; GFX1250-FAKE16-NEXT: s_and_not1_b32 exec_lo, exec_lo, s0
; GFX1250-FAKE16-NEXT: s_cbranch_execnz .LBB52_1
; GFX1250-FAKE16-NEXT: ; %bb.2: ; %atomicrmw.end
@@ -13154,7 +13146,6 @@ define void @global_system_atomic_fadd_noret_f16__offset12b_pos__amdgpu_no_fine_
; GFX1250-TRUE16-NEXT: s_wait_loadcnt 0x0
; GFX1250-TRUE16-NEXT: global_inv scope:SCOPE_SYS
; GFX1250-TRUE16-NEXT: v_cmp_eq_u32_e32 vcc_lo, v4, v5
-; GFX1250-TRUE16-NEXT: s_wait_xcnt 0x0
; GFX1250-TRUE16-NEXT: v_mov_b32_e32 v5, v4
; GFX1250-TRUE16-NEXT: s_or_b32 s0, vcc_lo, s0
; GFX1250-TRUE16-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
@@ -13196,7 +13187,6 @@ define void @global_system_atomic_fadd_noret_f16__offset12b_pos__amdgpu_no_fine_
; GFX1250-FAKE16-NEXT: s_wait_loadcnt 0x0
; GFX1250-FAKE16-NEXT: global_inv scope:SCOPE_SYS
; GFX1250-FAKE16-NEXT: v_cmp_eq_u32_e32 vcc_lo, v4, v5
-; GFX1250-FAKE16-NEXT: s_wait_xcnt 0x0
; GFX1250-FAKE16-NEXT: v_mov_b32_e32 v5, v4
; GFX1250-FAKE16-NEXT: s_or_b32 s0, vcc_lo, s0
; GFX1250-FAKE16-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
@@ -13676,7 +13666,7 @@ define bfloat @global_agent_atomic_fadd_ret_bf16__amdgpu_no_fine_grained_memory(
; GFX1250-TRUE16-NEXT: global_inv scope:SCOPE_DEV
; GFX1250-TRUE16-NEXT: v_cmp_eq_u32_e32 vcc_lo, v5, v7
; GFX1250-TRUE16-NEXT: s_or_b32 s0, vcc_lo, s0
-; GFX1250-TRUE16-NEXT: s_wait_xcnt 0x0
+; GFX1250-TRUE16-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
; GFX1250-TRUE16-NEXT: s_and_not1_b32 exec_lo, exec_lo, s0
; GFX1250-TRUE16-NEXT: s_cbranch_execnz .LBB54_1
; GFX1250-TRUE16-NEXT: ; %bb.2: ; %atomicrmw.end
@@ -13722,7 +13712,7 @@ define bfloat @global_agent_atomic_fadd_ret_bf16__amdgpu_no_fine_grained_memory(
; GFX1250-FAKE16-NEXT: global_inv scope:SCOPE_DEV
; GFX1250-FAKE16-NEXT: v_cmp_eq_u32_e32 vcc_lo, v5, v7
; GFX1250-FAKE16-NEXT: s_or_b32 s0, vcc_lo, s0
-; GFX1250-FAKE16-NEXT: s_wait_xcnt 0x0
+; GFX1250-FAKE16-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
; GFX1250-FAKE16-NEXT: s_and_not1_b32 exec_lo, exec_lo, s0
; GFX1250-FAKE16-NEXT: s_cbranch_execnz .LBB54_1
; GFX1250-FAKE16-NEXT: ; %bb.2: ; %atomicrmw.end
@@ -14273,7 +14263,7 @@ define bfloat @global_agent_atomic_fadd_ret_bf16__offset12b_pos__amdgpu_no_fine_
; GFX1250-TRUE16-NEXT: global_inv scope:SCOPE_DEV
; GFX1250-TRUE16-NEXT: v_cmp_eq_u32_e32 vcc_lo, v5, v7
; GFX1250-TRUE16-NEXT: s_or_b32 s0, vcc_lo, s0
-; GFX1250-TRUE16-NEXT: s_wait_xcnt 0x0
+; GFX1250-TRUE16-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
; GFX1250-TRUE16-NEXT: s_and_not1_b32 exec_lo, exec_lo, s0
; GFX1250-TRUE16-NEXT: s_cbranch_execnz .LBB55_1
; GFX1250-TRUE16-NEXT: ; %bb.2: ; %atomicrmw.end
@@ -14319,7 +14309,7 @@ define bfloat @global_agent_atomic_fadd_ret_bf16__offset12b_pos__amdgpu_no_fine_
; GFX1250-FAKE16-NEXT: global_inv scope:SCOPE_DEV
; GFX1250-FAKE16-NEXT: v_cmp_eq_u32_e32 vcc_lo, v5, v7
; GFX1250-FAKE16-NEXT: s_or_b32 s0, vcc_lo, s0
-; GFX1250-FAKE16-NEXT: s_wait_xcnt 0x0
+; GFX1250-FAKE16-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
; GFX1250-FAKE16-NEXT: s_and_not1_b32 exec_lo, exec_lo, s0
; GFX1250-FAKE16-NEXT: s_cbranch_execnz .LBB55_1
; GFX1250-FAKE16-NEXT: ; %bb.2: ; %atomicrmw.end
@@ -14888,7 +14878,7 @@ define bfloat @global_agent_atomic_fadd_ret_bf16__offset12b_neg__amdgpu_no_fine_
; GFX1250-TRUE16-NEXT: global_inv scope:SCOPE_DEV
; GFX1250-TRUE16-NEXT: v_cmp_eq_u32_e32 vcc_lo, v5, v7
; GFX1250-TRUE16-NEXT: s_or_b32 s0, vcc_lo, s0
-; GFX1250-TRUE16-NEXT: s_wait_xcnt 0x0
+; GFX1250-TRUE16-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
; GFX1250-TRUE16-NEXT: s_and_not1_b32 exec_lo, exec_lo, s0
; GFX1250-TRUE16-NEXT: s_cbranch_execnz .LBB56_1
; GFX1250-TRUE16-NEXT: ; %bb.2: ; %atomicrmw.end
@@ -14936,7 +14926,7 @@ define bfloat @global_agent_atomic_fadd_ret_bf16__offset12b_neg__amdgpu_no_fine_
; GFX1250-FAKE16-NEXT: global_inv scope:SCOPE_DEV
; GFX1250-FAKE16-NEXT: v_cmp_eq_u32_e32 vcc_lo, v5, v7
; GFX1250-FAKE16-NEXT: s_or_b32 s0, vcc_lo, s0
-; GFX1250-FAKE16-NEXT: s_wait_xcnt 0x0
+; GFX1250-FAKE16-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
; GFX1250-FAKE16-NEXT: s_and_not1_b32 exec_lo, exec_lo, s0
; GFX1250-FAKE16-NEXT: s_cbranch_execnz .LBB56_1
; GFX1250-FAKE16-NEXT: ; %bb.2: ; %atomicrmw.end
@@ -15502,7 +15492,6 @@ define void @global_agent_atomic_fadd_noret_bf16__amdgpu_no_fine_grained_memory(
; GFX1250-TRUE16-NEXT: s_wait_loadcnt 0x0
; GFX1250-TRUE16-NEXT: global_inv scope:SCOPE_DEV
; GFX1250-TRUE16-NEXT: v_cmp_eq_u32_e32 vcc_lo, v4, v5
-; GFX1250-TRUE16-NEXT: s_wait_xcnt 0x0
; GFX1250-TRUE16-NEXT: v_mov_b32_e32 v5, v4
; GFX1250-TRUE16-NEXT: s_or_b32 s0, vcc_lo, s0
; GFX1250-TRUE16-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
@@ -15547,7 +15536,6 @@ define void @global_agent_atomic_fadd_noret_bf16__amdgpu_no_fine_grained_memory(
; GFX1250-FAKE16-NEXT: s_wait_loadcnt 0x0
; GFX1250-FAKE16-NEXT: global_inv scope:SCOPE_DEV
; GFX1250-FAKE16-NEXT: v_cmp_eq_u32_e32 vcc_lo, v4, v5
-; GFX1250-FAKE16-NEXT: s_wait_xcnt 0x0
; GFX1250-FAKE16-NEXT: v_mov_b32_e32 v5, v4
; GFX1250-FAKE16-NEXT: s_or_b32 s0, vcc_lo, s0
; GFX1250-FAKE16-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
@@ -16081,7 +16069,6 @@ define void @global_agent_atomic_fadd_noret_bf16__offset12b_pos__amdgpu_no_fine_
; GFX1250-TRUE16-NEXT: s_wait_loadcnt 0x0
; GFX1250-TRUE16-NEXT: global_inv scope:SCOPE_DEV
; GFX1250-TRUE16-NEXT: v_cmp_eq_u32_e32 vcc_lo, v4, v5
-; GFX1250-TRUE16-NEXT: s_wait_xcnt 0x0
; GFX1250-TRUE16-NEXT: v_mov_b32_e32 v5, v4
; GFX1250-TRUE16-NEXT: s_or_b32 s0, vcc_lo, s0
; GFX1250-TRUE16-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
@@ -16126,7 +16113,6 @@ define void @global_agent_atomic_fadd_noret_bf16__offset12b_pos__amdgpu_no_fine_
; GFX1250-FAKE16-NEXT: s_wait_loadcnt 0x0
; GFX1250-FAKE16-NEXT: global_inv scope:SCOPE_DEV
; GFX1250-FAKE16-NEXT: v_cmp_eq_u32_e32 vcc_lo, v2, v3
-; GFX1250-FAKE16-NEXT: s_wait_xcnt 0x0
; GFX1250-FAKE16-NEXT: v_mov_b32_e32 v3, v2
; GFX1250-FAKE16-NEXT: s_or_b32 s0, vcc_lo, s0
; GFX1250-FAKE16-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
@@ -16678,7 +16664,6 @@ define void @global_agent_atomic_fadd_noret_bf16__offset12b_neg__amdgpu_no_fine_
; GFX1250-TRUE16-NEXT: s_wait_loadcnt 0x0
; GFX1250-TRUE16-NEXT: global_inv scope:SCOPE_DEV
; GFX1250-TRUE16-NEXT: v_cmp_eq_u32_e32 vcc_lo, v4, v5
-; GFX1250-TRUE16-NEXT: s_wait_xcnt 0x0
; GFX1250-TRUE16-NEXT: v_mov_b32_e32 v5, v4
; GFX1250-TRUE16-NEXT: s_or_b32 s0, vcc_lo, s0
; GFX1250-TRUE16-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
@@ -16725,7 +16710,6 @@ define void @global_agent_atomic_fadd_noret_bf16__offset12b_neg__amdgpu_no_fine_
; GFX1250-FAKE16-NEXT: s_wait_loadcnt 0x0
; GFX1250-FAKE16-NEXT: global_inv scope:SCOPE_DEV
; GFX1250-FAKE16-NEXT: v_cmp_eq_u32_e32 vcc_lo, v2, v3
-; GFX1250-FAKE16-NEXT: s_wait_xcnt 0x0
; GFX1250-FAKE16-NEXT: v_mov_b32_e32 v3, v2
; GFX1250-FAKE16-NEXT: s_or_b32 s0, vcc_lo, s0
; GFX1250-FAKE16-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
@@ -17269,7 +17253,7 @@ define bfloat @global_agent_atomic_fadd_ret_bf16__offset12b_pos__align4__amdgpu_
; GFX1250-TRUE16-NEXT: global_inv scope:SCOPE_DEV
; GFX1250-TRUE16-NEXT: v_cmp_eq_u32_e32 vcc_lo, v3, v5
; GFX1250-TRUE16-NEXT: s_or_b32 s0, vcc_lo, s0
-; GFX1250-TRUE16-NEXT: s_wait_xcnt 0x0
+; GFX1250-TRUE16-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
; GFX1250-TRUE16-NEXT: s_and_not1_b32 exec_lo, exec_lo, s0
; GFX1250-TRUE16-NEXT: s_cbranch_execnz .LBB60_1
; GFX1250-TRUE16-NEXT: ; %bb.2: ; %atomicrmw.end
@@ -17305,7 +17289,7 @@ define bfloat @global_agent_atomic_fadd_ret_bf16__offset12b_pos__align4__amdgpu_
; GFX1250-FAKE16-NEXT: global_inv scope:SCOPE_DEV
; GFX1250-FAKE16-NEXT: v_cmp_eq_u32_e32 vcc_lo, v3, v5
; GFX1250-FAKE16-NEXT: s_or_b32 s0, vcc_lo, s0
-; GFX1250-FAKE16-NEXT: s_wait_xcnt 0x0
+; GFX1250-FAKE16-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
; GFX1250-FAKE16-NEXT: s_and_not1_b32 exec_lo, exec_lo, s0
; GFX1250-FAKE16-NEXT: s_cbranch_execnz .LBB60_1
; GFX1250-FAKE16-NEXT: ; %bb.2: ; %atomicrmw.end
@@ -17753,7 +17737,6 @@ define void @global_agent_atomic_fadd_noret_bf16__offset12b__align4_pos__amdgpu_
; GFX1250-TRUE16-NEXT: s_wait_loadcnt 0x0
; GFX1250-TRUE16-NEXT: global_inv scope:SCOPE_DEV
; GFX1250-TRUE16-NEXT: v_cmp_eq_u32_e32 vcc_lo, v3, v5
-; GFX1250-TRUE16-NEXT: s_wait_xcnt 0x0
; GFX1250-TRUE16-NEXT: v_mov_b32_e32 v5, v3
; GFX1250-TRUE16-NEXT: s_or_b32 s0, vcc_lo, s0
; GFX1250-TRUE16-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
@@ -17788,7 +17771,6 @@ define void @global_agent_atomic_fadd_noret_bf16__offset12b__align4_pos__amdgpu_
; GFX1250-FAKE16-NEXT: s_wait_loadcnt 0x0
; GFX1250-FAKE16-NEXT: global_inv scope:SCOPE_DEV
; GFX1250-FAKE16-NEXT: v_cmp_eq_u32_e32 vcc_lo, v2, v3
-; GFX1250-FAKE16-NEXT: s_wait_xcnt 0x0
; GFX1250-FAKE16-NEXT: v_mov_b32_e32 v3, v2
; GFX1250-FAKE16-NEXT: s_or_b32 s0, vcc_lo, s0
; GFX1250-FAKE16-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
@@ -18238,7 +18220,7 @@ define bfloat @global_system_atomic_fadd_ret_bf16__offset12b_pos__amdgpu_no_fine
; GFX1250-TRUE16-NEXT: global_inv scope:SCOPE_SYS
; GFX1250-TRUE16-NEXT: v_cmp_eq_u32_e32 vcc_lo, v5, v7
; GFX1250-TRUE16-NEXT: s_or_b32 s0, vcc_lo, s0
-; GFX1250-TRUE16-NEXT: s_wait_xcnt 0x0
+; GFX1250-TRUE16-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
; GFX1250-TRUE16-NEXT: s_and_not1_b32 exec_lo, exec_lo, s0
; GFX1250-TRUE16-NEXT: s_cbranch_execnz .LBB62_1
; GFX1250-TRUE16-NEXT: ; %bb.2: ; %atomicrmw.end
@@ -18284,7 +18266,7 @@ define bfloat @global_system_atomic_fadd_ret_bf16__offset12b_pos__amdgpu_no_fine
; GFX1250-FAKE16-NEXT: global_inv scope:SCOPE_SYS
; GFX1250-FAKE16-NEXT: v_cmp_eq_u32_e32 vcc_lo, v5, v7
; GFX1250-FAKE16-NEXT: s_or_b32 s0, vcc_lo, s0
-; GFX1250-FAKE16-NEXT: s_wait_xcnt 0x0
+; GFX1250-FAKE16-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
; GFX1250-FAKE16-NEXT: s_and_not1_b32 exec_lo, exec_lo, s0
; GFX1250-FAKE16-NEXT: s_cbranch_execnz .LBB62_1
; GFX1250-FAKE16-NEXT: ; %bb.2: ; %atomicrmw.end
@@ -18854,7 +18836,6 @@ define void @global_system_atomic_fadd_noret_bf16__offset12b_pos__amdgpu_no_fine
; GFX1250-TRUE16-NEXT: s_wait_loadcnt 0x0
; GFX1250-TRUE16-NEXT: global_inv scope:SCOPE_SYS
; GFX1250-TRUE16-NEXT: v_cmp_eq_u32_e32 vcc_lo, v4, v5
-; GFX1250-TRUE16-NEXT: s_wait_xcnt 0x0
; GFX1250-TRUE16-NEXT: v_mov_b32_e32 v5, v4
; GFX1250-TRUE16-NEXT: s_or_b32 s0, vcc_lo, s0
; GFX1250-TRUE16-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
@@ -18899,7 +18880,6 @@ define void @global_system_atomic_fadd_noret_bf16__offset12b_pos__amdgpu_no_fine
; GFX1250-FAKE16-NEXT: s_wait_loadcnt 0x0
; GFX1250-FAKE16-NEXT: global_inv scope:SCOPE_SYS
; GFX1250-FAKE16-NEXT: v_cmp_eq_u32_e32 vcc_lo, v2, v3
-; GFX1250-FAKE16-NEXT: s_wait_xcnt 0x0
; GFX1250-FAKE16-NEXT: v_mov_b32_e32 v3, v2
; GFX1250-FAKE16-NEXT: s_or_b32 s0, vcc_lo, s0
; GFX1250-FAKE16-NEXT: s_delay_alu instid0(SALU_CYCLE_1)
diff --git a/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.is.shared.ll b/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.is.shared.ll
index 355d0026091d9..7aecae901becf 100644
--- a/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.is.shared.ll
+++ b/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.is.shared.ll
@@ -101,7 +101,6 @@ define amdgpu_kernel void @is_local_vgpr(ptr addrspace(1) %ptr.ptr) {
; GFX1250-NEXT: global_load_b64 v[0:1], v0, s[2:3] scale_offset scope:SCOPE_SYS
; GFX1250-NEXT: s_wait_loadcnt 0x0
; GFX1250-NEXT: v_cmp_eq_u32_e32 vcc_lo, s1, v1
-; GFX1250-NEXT: s_wait_xcnt 0x0
; GFX1250-NEXT: v_cndmask_b32_e64 v0, 0, 1, vcc_lo
; GFX1250-NEXT: global_store_b32 v[0:1], v0, off
; GFX1250-NEXT: s_endpgm
>From 238cafacb65c7ce7647d4cde69493fbf912f1d20 Mon Sep 17 00:00:00 2001
From: Ryan Mitchell <Ryan.Mitchell at amd.com>
Date: Mon, 3 Nov 2025 13:33:04 -0800
Subject: [PATCH 2/3] [AMDGPU][SIInsertWaitCnts] Add mixed pending event xcnt
test
---
llvm/test/CodeGen/AMDGPU/wait-xcnt.mir | 45 ++++++++++++++++++++++++++
1 file changed, 45 insertions(+)
diff --git a/llvm/test/CodeGen/AMDGPU/wait-xcnt.mir b/llvm/test/CodeGen/AMDGPU/wait-xcnt.mir
index a1381ecad81e2..1e3b57c83844d 100644
--- a/llvm/test/CodeGen/AMDGPU/wait-xcnt.mir
+++ b/llvm/test/CodeGen/AMDGPU/wait-xcnt.mir
@@ -1069,6 +1069,51 @@ body: |
$sgpr0 = S_MOV_B32 $sgpr0
...
+---
+name: mixed_pending_events
+tracksRegLiveness: true
+machineFunctionInfo:
+ isEntryFunction: true
+body: |
+ ; GCN-LABEL: name: mixed_pending_events
+ ; GCN: bb.0:
+ ; GCN-NEXT: successors: %bb.2(0x40000000), %bb.1(0x40000000)
+ ; GCN-NEXT: liveins: $vgpr0_vgpr1, $sgpr0_sgpr1, $scc
+ ; GCN-NEXT: {{ $}}
+ ; GCN-NEXT: $sgpr2 = S_LOAD_DWORD_IMM $sgpr0_sgpr1, 0, 0
+ ; GCN-NEXT: S_CBRANCH_SCC1 %bb.2, implicit $scc
+ ; GCN-NEXT: {{ $}}
+ ; GCN-NEXT: bb.1:
+ ; GCN-NEXT: successors: %bb.2(0x80000000)
+ ; GCN-NEXT: liveins: $vgpr0_vgpr1, $sgpr2
+ ; GCN-NEXT: {{ $}}
+ ; GCN-NEXT: $vgpr2 = GLOBAL_LOAD_DWORD $vgpr0_vgpr1, 0, 0, implicit $exec
+ ; GCN-NEXT: $vgpr3 = GLOBAL_LOAD_DWORD $vgpr0_vgpr1, 0, 0, implicit $exec
+ ; GCN-NEXT: {{ $}}
+ ; GCN-NEXT: bb.2:
+ ; GCN-NEXT: liveins: $sgpr2, $vgpr2
+ ; GCN-NEXT: {{ $}}
+ ; GCN-NEXT: S_WAIT_LOADCNT 1
+ ; GCN-NEXT: $vgpr2 = V_MOV_B32_e32 $vgpr2, implicit $exec
+ ; GCN-NEXT: S_WAIT_KMCNT 0
+ ; GCN-NEXT: $sgpr2 = S_MOV_B32 $sgpr2
+ ; GCN-NEXT: S_WAIT_XCNT 0
+ ; GCN-NEXT: $vgpr0 = V_MOV_B32_e32 0, implicit $exec
+ bb.0:
+ liveins: $vgpr0_vgpr1, $sgpr0_sgpr1, $scc
+ $sgpr2 = S_LOAD_DWORD_IMM $sgpr0_sgpr1, 0, 0
+ S_CBRANCH_SCC1 %bb.2, implicit $scc
+ bb.1:
+ liveins: $vgpr0_vgpr1, $sgpr2
+ $vgpr2 = GLOBAL_LOAD_DWORD $vgpr0_vgpr1, 0, 0, implicit $exec
+ $vgpr3 = GLOBAL_LOAD_DWORD $vgpr0_vgpr1, 0, 0, implicit $exec
+ bb.2:
+ liveins: $sgpr2, $vgpr2
+ $vgpr2 = V_MOV_B32_e32 $vgpr2, implicit $exec
+ $sgpr2 = S_MOV_B32 $sgpr2
+ $vgpr0 = V_MOV_B32_e32 0, implicit $exec
+...
+
---
name: pending_vmem_event_between_block
tracksRegLiveness: true
>From 0488ac72d423087f25e8762ad83ca37f8e1fdc00 Mon Sep 17 00:00:00 2001
From: Ryan Mitchell <Ryan.Mitchell at amd.com>
Date: Mon, 3 Nov 2025 13:52:44 -0800
Subject: [PATCH 3/3] [AMDGPU][SIInsertWaitCnts] format
---
llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp b/llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp
index b6e2c3a7f8950..1da7e8ceb6c6f 100644
--- a/llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp
+++ b/llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp
@@ -1307,7 +1307,8 @@ bool WaitcntBrackets::canOptimizeXCntWithLoadCnt(const AMDGPU::Waitcnt &Wait) {
void WaitcntBrackets::applyXcnt(const AMDGPU::Waitcnt &Wait) {
if (hasRedundantXCntWithKmCnt(Wait)) {
if (hasPendingEvent(VMEM_GROUP))
- // Only clear the SMEM_GROUP event, but VMEM_GROUP could still require handling.
+ // Only clear the SMEM_GROUP event, but VMEM_GROUP could still require
+ // handling.
PendingEvents &= ~(1 << SMEM_GROUP);
else
applyWaitcnt(X_CNT, 0);
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