[llvm] [ValueTracking] NFC: Allow tracking values through AddrSpaceCasts (PR #70483)
Jeffrey Byrnes via llvm-commits
llvm-commits at lists.llvm.org
Tue Oct 31 16:37:31 PDT 2023
https://github.com/jrbyrnes updated https://github.com/llvm/llvm-project/pull/70483
>From 4633db95f680e0400a4347117e3a60321e88e8d5 Mon Sep 17 00:00:00 2001
From: Jeffrey Byrnes <Jeffrey.Byrnes at amd.com>
Date: Tue, 24 Oct 2023 13:18:17 -0700
Subject: [PATCH] [ValueTracking] Allow tracking values through Integral
AddrSpaceCasts
Change-Id: Ia9efb192bf6a8e156897429c0c2926ee19bd12de
---
llvm/include/llvm/Support/KnownBits.h | 8 +
llvm/lib/Analysis/ValueTracking.cpp | 33 ++++
.../CodeGen/AMDGPU/memcpy-crash-issue63986.ll | 162 +++++++++---------
.../InstCombine/memcpy-from-global.ll | 4 +-
4 files changed, 123 insertions(+), 84 deletions(-)
diff --git a/llvm/include/llvm/Support/KnownBits.h b/llvm/include/llvm/Support/KnownBits.h
index fb034e0b9e3baff..8f7a7fd0fde6f82 100644
--- a/llvm/include/llvm/Support/KnownBits.h
+++ b/llvm/include/llvm/Support/KnownBits.h
@@ -148,6 +148,14 @@ struct KnownBits {
return Max;
}
+ KnownBits clearBitsBelow(unsigned BitWidth) {
+ APInt NewZero = Zero;
+ APInt NewOne = One;
+ NewZero.clearLowBits(BitWidth);
+ NewOne.clearLowBits(BitWidth);
+ return KnownBits(NewZero, NewOne);
+ }
+
/// Return known bits for a truncation of the value we're tracking.
KnownBits trunc(unsigned BitWidth) const {
return KnownBits(Zero.trunc(BitWidth), One.trunc(BitWidth));
diff --git a/llvm/lib/Analysis/ValueTracking.cpp b/llvm/lib/Analysis/ValueTracking.cpp
index c303d261107eb19..2524fc15d6687f7 100644
--- a/llvm/lib/Analysis/ValueTracking.cpp
+++ b/llvm/lib/Analysis/ValueTracking.cpp
@@ -1775,6 +1775,39 @@ static void computeKnownBitsFromOperator(const Operator *I,
Depth + 1))
computeKnownBits(I->getOperand(0), Known, Depth + 1, Q);
break;
+ case Instruction::AddrSpaceCast: {
+ auto ASC = dyn_cast<AddrSpaceCastOperator>(I);
+ assert(ASC);
+ unsigned SrcAS = ASC->getSrcAddressSpace();
+ unsigned DestAS = ASC->getDestAddressSpace();
+
+ auto DL = Q.DL;
+ if (DL.isNonIntegralAddressSpace(SrcAS) ||
+ DL.isNonIntegralAddressSpace(DestAS))
+ break;
+
+ auto SrcSize = DL.getPointerSizeInBits(SrcAS);
+ auto DstSize = DL.getPointerSizeInBits(DestAS);
+
+ if (DstSize > SrcSize) {
+ Known2 = Known;
+ Known = Known.trunc(SrcSize);
+ computeKnownBits(I->getOperand(0), DemandedElts, Known, Depth + 1, Q);
+ Known = Known.anyext(DstSize);
+ Known2 = Known2.clearBitsBelow(SrcSize);
+ Known = Known.unionWith(Known2);
+ }
+
+ else if (DstSize < SrcSize) {
+ Known = Known.anyext(SrcSize);
+ computeKnownBits(I->getOperand(0), DemandedElts, Known, Depth + 1, Q);
+ Known = Known.trunc(DstSize);
+ }
+
+ else {
+ computeKnownBits(I->getOperand(0), DemandedElts, Known, Depth + 1, Q);
+ }
+ }
}
}
diff --git a/llvm/test/CodeGen/AMDGPU/memcpy-crash-issue63986.ll b/llvm/test/CodeGen/AMDGPU/memcpy-crash-issue63986.ll
index 0e6c1aecb6774a3..73dbb4b72f03f5b 100644
--- a/llvm/test/CodeGen/AMDGPU/memcpy-crash-issue63986.ll
+++ b/llvm/test/CodeGen/AMDGPU/memcpy-crash-issue63986.ll
@@ -9,70 +9,68 @@ define void @issue63986(i64 %0, i64 %idxprom) {
; CHECK-NEXT: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
; CHECK-NEXT: v_lshlrev_b64 v[4:5], 6, v[2:3]
; CHECK-NEXT: s_mov_b64 s[4:5], 0
-; CHECK-NEXT: ; %bb.1: ; %loop-memcpy-expansion.preheader
-; CHECK-NEXT: v_lshlrev_b64 v[6:7], 6, v[2:3]
; CHECK-NEXT: s_mov_b64 s[6:7], 0
-; CHECK-NEXT: .LBB0_2: ; %loop-memcpy-expansion
+; CHECK-NEXT: .LBB0_1: ; %loop-memcpy-expansion
; CHECK-NEXT: ; =>This Inner Loop Header: Depth=1
-; CHECK-NEXT: v_mov_b32_e32 v9, s7
-; CHECK-NEXT: v_mov_b32_e32 v8, s6
-; CHECK-NEXT: flat_load_ubyte v10, v[8:9] offset:5
-; CHECK-NEXT: flat_load_ubyte v11, v[8:9] offset:6
-; CHECK-NEXT: flat_load_ubyte v12, v[8:9] offset:7
-; CHECK-NEXT: flat_load_ubyte v13, v[8:9] offset:3
-; CHECK-NEXT: flat_load_ubyte v14, v[8:9] offset:2
-; CHECK-NEXT: flat_load_ubyte v15, v[8:9] offset:1
-; CHECK-NEXT: flat_load_ubyte v16, v[8:9]
-; CHECK-NEXT: flat_load_ubyte v17, v[8:9] offset:4
-; CHECK-NEXT: flat_load_ubyte v18, v[8:9] offset:13
-; CHECK-NEXT: flat_load_ubyte v19, v[8:9] offset:14
-; CHECK-NEXT: flat_load_ubyte v20, v[8:9] offset:15
-; CHECK-NEXT: flat_load_ubyte v21, v[8:9] offset:11
-; CHECK-NEXT: flat_load_ubyte v22, v[8:9] offset:10
-; CHECK-NEXT: flat_load_ubyte v23, v[8:9] offset:9
-; CHECK-NEXT: flat_load_ubyte v24, v[8:9] offset:8
-; CHECK-NEXT: flat_load_ubyte v25, v[8:9] offset:12
+; CHECK-NEXT: v_mov_b32_e32 v6, s6
+; CHECK-NEXT: v_mov_b32_e32 v7, s7
+; CHECK-NEXT: flat_load_ubyte v8, v[6:7] offset:5
+; CHECK-NEXT: flat_load_ubyte v9, v[6:7] offset:6
+; CHECK-NEXT: flat_load_ubyte v10, v[6:7] offset:7
+; CHECK-NEXT: flat_load_ubyte v11, v[6:7] offset:3
+; CHECK-NEXT: flat_load_ubyte v12, v[6:7] offset:2
+; CHECK-NEXT: flat_load_ubyte v13, v[6:7] offset:1
+; CHECK-NEXT: flat_load_ubyte v14, v[6:7]
+; CHECK-NEXT: flat_load_ubyte v15, v[6:7] offset:4
+; CHECK-NEXT: flat_load_ubyte v16, v[6:7] offset:13
+; CHECK-NEXT: flat_load_ubyte v17, v[6:7] offset:14
+; CHECK-NEXT: flat_load_ubyte v18, v[6:7] offset:15
+; CHECK-NEXT: flat_load_ubyte v19, v[6:7] offset:11
+; CHECK-NEXT: flat_load_ubyte v20, v[6:7] offset:10
+; CHECK-NEXT: flat_load_ubyte v21, v[6:7] offset:9
+; CHECK-NEXT: flat_load_ubyte v22, v[6:7] offset:8
+; CHECK-NEXT: flat_load_ubyte v23, v[6:7] offset:12
; CHECK-NEXT: s_add_u32 s4, s4, 1
; CHECK-NEXT: s_addc_u32 s5, s5, 0
-; CHECK-NEXT: v_add_co_u32_e32 v8, vcc, s6, v6
+; CHECK-NEXT: v_add_co_u32_e32 v6, vcc, s6, v4
; CHECK-NEXT: v_cmp_ge_u64_e64 s[8:9], s[4:5], 2
-; CHECK-NEXT: v_addc_co_u32_e32 v9, vcc, v9, v7, vcc
+; CHECK-NEXT: v_addc_co_u32_e32 v7, vcc, v7, v5, vcc
; CHECK-NEXT: s_add_u32 s6, s6, 16
; CHECK-NEXT: s_addc_u32 s7, s7, 0
; CHECK-NEXT: s_and_b64 vcc, exec, s[8:9]
; CHECK-NEXT: s_waitcnt vmcnt(0) lgkmcnt(0)
-; CHECK-NEXT: flat_store_byte v[8:9], v13 offset:3
-; CHECK-NEXT: flat_store_byte v[8:9], v14 offset:2
-; CHECK-NEXT: flat_store_byte v[8:9], v15 offset:1
-; CHECK-NEXT: flat_store_byte v[8:9], v16
-; CHECK-NEXT: flat_store_byte v[8:9], v12 offset:7
-; CHECK-NEXT: flat_store_byte v[8:9], v11 offset:6
-; CHECK-NEXT: flat_store_byte v[8:9], v10 offset:5
-; CHECK-NEXT: flat_store_byte v[8:9], v17 offset:4
-; CHECK-NEXT: flat_store_byte v[8:9], v21 offset:11
-; CHECK-NEXT: flat_store_byte v[8:9], v22 offset:10
-; CHECK-NEXT: flat_store_byte v[8:9], v23 offset:9
-; CHECK-NEXT: flat_store_byte v[8:9], v24 offset:8
-; CHECK-NEXT: flat_store_byte v[8:9], v20 offset:15
-; CHECK-NEXT: flat_store_byte v[8:9], v19 offset:14
-; CHECK-NEXT: flat_store_byte v[8:9], v18 offset:13
-; CHECK-NEXT: flat_store_byte v[8:9], v25 offset:12
-; CHECK-NEXT: s_cbranch_vccz .LBB0_2
-; CHECK-NEXT: ; %bb.3: ; %loop-memcpy-residual-header
+; CHECK-NEXT: flat_store_byte v[6:7], v11 offset:3
+; CHECK-NEXT: flat_store_byte v[6:7], v12 offset:2
+; CHECK-NEXT: flat_store_byte v[6:7], v13 offset:1
+; CHECK-NEXT: flat_store_byte v[6:7], v14
+; CHECK-NEXT: flat_store_byte v[6:7], v10 offset:7
+; CHECK-NEXT: flat_store_byte v[6:7], v9 offset:6
+; CHECK-NEXT: flat_store_byte v[6:7], v8 offset:5
+; CHECK-NEXT: flat_store_byte v[6:7], v15 offset:4
+; CHECK-NEXT: flat_store_byte v[6:7], v19 offset:11
+; CHECK-NEXT: flat_store_byte v[6:7], v20 offset:10
+; CHECK-NEXT: flat_store_byte v[6:7], v21 offset:9
+; CHECK-NEXT: flat_store_byte v[6:7], v22 offset:8
+; CHECK-NEXT: flat_store_byte v[6:7], v18 offset:15
+; CHECK-NEXT: flat_store_byte v[6:7], v17 offset:14
+; CHECK-NEXT: flat_store_byte v[6:7], v16 offset:13
+; CHECK-NEXT: flat_store_byte v[6:7], v23 offset:12
+; CHECK-NEXT: s_cbranch_vccz .LBB0_1
+; CHECK-NEXT: ; %bb.2: ; %loop-memcpy-residual-header
; CHECK-NEXT: s_and_b32 s4, 32, 15
; CHECK-NEXT: s_mov_b32 s5, 0
-; CHECK-NEXT: s_cbranch_scc0 .LBB0_5
-; CHECK-NEXT: ; %bb.4:
+; CHECK-NEXT: s_cbranch_scc0 .LBB0_4
+; CHECK-NEXT: ; %bb.3:
; CHECK-NEXT: ; implicit-def: $vgpr2_vgpr3
-; CHECK-NEXT: s_branch .LBB0_6
-; CHECK-NEXT: .LBB0_5: ; %loop-memcpy-residual-header.post-loop-memcpy-expansion_crit_edge
+; CHECK-NEXT: s_branch .LBB0_5
+; CHECK-NEXT: .LBB0_4: ; %loop-memcpy-residual-header.post-loop-memcpy-expansion_crit_edge
; CHECK-NEXT: v_lshlrev_b64 v[2:3], 6, v[2:3]
-; CHECK-NEXT: s_cbranch_execnz .LBB0_9
-; CHECK-NEXT: .LBB0_6: ; %loop-memcpy-residual.preheader
+; CHECK-NEXT: s_cbranch_execnz .LBB0_8
+; CHECK-NEXT: .LBB0_5: ; %loop-memcpy-residual.preheader
; CHECK-NEXT: v_or_b32_e32 v2, 32, v4
; CHECK-NEXT: v_mov_b32_e32 v3, v5
; CHECK-NEXT: s_mov_b64 s[6:7], 0
-; CHECK-NEXT: .LBB0_7: ; %loop-memcpy-residual
+; CHECK-NEXT: .LBB0_6: ; %loop-memcpy-residual
; CHECK-NEXT: ; =>This Inner Loop Header: Depth=1
; CHECK-NEXT: s_add_u32 s8, 32, s6
; CHECK-NEXT: s_addc_u32 s9, 0, s7
@@ -85,15 +83,15 @@ define void @issue63986(i64 %0, i64 %idxprom) {
; CHECK-NEXT: s_add_u32 s6, s6, 1
; CHECK-NEXT: v_mov_b32_e32 v6, s4
; CHECK-NEXT: v_addc_co_u32_e32 v9, vcc, v3, v9, vcc
-; CHECK-NEXT: s_addc_u32 s7, s7, 0
+; CHECK-NEXT: s_addc_u32 s7, 0, s7
; CHECK-NEXT: v_cmp_lt_u64_e32 vcc, s[6:7], v[6:7]
; CHECK-NEXT: s_waitcnt vmcnt(0) lgkmcnt(0)
; CHECK-NEXT: flat_store_byte v[8:9], v10
-; CHECK-NEXT: s_cbranch_vccnz .LBB0_7
-; CHECK-NEXT: ; %bb.8:
+; CHECK-NEXT: s_cbranch_vccnz .LBB0_6
+; CHECK-NEXT: ; %bb.7:
; CHECK-NEXT: v_mov_b32_e32 v2, v4
; CHECK-NEXT: v_mov_b32_e32 v3, v5
-; CHECK-NEXT: .LBB0_9: ; %post-loop-memcpy-expansion
+; CHECK-NEXT: .LBB0_8: ; %post-loop-memcpy-expansion
; CHECK-NEXT: v_lshrrev_b64 v[4:5], 4, v[0:1]
; CHECK-NEXT: v_and_b32_e32 v6, 15, v0
; CHECK-NEXT: v_mov_b32_e32 v7, 0
@@ -102,28 +100,28 @@ define void @issue63986(i64 %0, i64 %idxprom) {
; CHECK-NEXT: v_cmp_ne_u64_e64 s[6:7], 0, v[6:7]
; CHECK-NEXT: v_add_co_u32_e32 v8, vcc, v2, v0
; CHECK-NEXT: v_addc_co_u32_e32 v9, vcc, v3, v1, vcc
-; CHECK-NEXT: s_branch .LBB0_12
-; CHECK-NEXT: .LBB0_10: ; %Flow19
-; CHECK-NEXT: ; in Loop: Header=BB0_12 Depth=1
+; CHECK-NEXT: s_branch .LBB0_11
+; CHECK-NEXT: .LBB0_9: ; %Flow19
+; CHECK-NEXT: ; in Loop: Header=BB0_11 Depth=1
; CHECK-NEXT: s_or_b64 exec, exec, s[10:11]
; CHECK-NEXT: s_mov_b64 s[8:9], 0
-; CHECK-NEXT: .LBB0_11: ; %Flow21
-; CHECK-NEXT: ; in Loop: Header=BB0_12 Depth=1
+; CHECK-NEXT: .LBB0_10: ; %Flow21
+; CHECK-NEXT: ; in Loop: Header=BB0_11 Depth=1
; CHECK-NEXT: s_andn2_b64 vcc, exec, s[8:9]
-; CHECK-NEXT: s_cbranch_vccz .LBB0_20
-; CHECK-NEXT: .LBB0_12: ; %while.cond
+; CHECK-NEXT: s_cbranch_vccz .LBB0_19
+; CHECK-NEXT: .LBB0_11: ; %while.cond
; CHECK-NEXT: ; =>This Loop Header: Depth=1
-; CHECK-NEXT: ; Child Loop BB0_14 Depth 2
-; CHECK-NEXT: ; Child Loop BB0_18 Depth 2
+; CHECK-NEXT: ; Child Loop BB0_13 Depth 2
+; CHECK-NEXT: ; Child Loop BB0_17 Depth 2
; CHECK-NEXT: s_and_saveexec_b64 s[8:9], s[4:5]
-; CHECK-NEXT: s_cbranch_execz .LBB0_15
-; CHECK-NEXT: ; %bb.13: ; %loop-memcpy-expansion2.preheader
-; CHECK-NEXT: ; in Loop: Header=BB0_12 Depth=1
+; CHECK-NEXT: s_cbranch_execz .LBB0_14
+; CHECK-NEXT: ; %bb.12: ; %loop-memcpy-expansion2.preheader
+; CHECK-NEXT: ; in Loop: Header=BB0_11 Depth=1
; CHECK-NEXT: s_mov_b64 s[10:11], 0
; CHECK-NEXT: s_mov_b64 s[12:13], 0
; CHECK-NEXT: s_mov_b64 s[14:15], 0
-; CHECK-NEXT: .LBB0_14: ; %loop-memcpy-expansion2
-; CHECK-NEXT: ; Parent Loop BB0_12 Depth=1
+; CHECK-NEXT: .LBB0_13: ; %loop-memcpy-expansion2
+; CHECK-NEXT: ; Parent Loop BB0_11 Depth=1
; CHECK-NEXT: ; => This Inner Loop Header: Depth=2
; CHECK-NEXT: v_mov_b32_e32 v10, s10
; CHECK-NEXT: v_mov_b32_e32 v11, s11
@@ -169,23 +167,23 @@ define void @issue63986(i64 %0, i64 %idxprom) {
; CHECK-NEXT: flat_store_byte v[10:11], v20 offset:13
; CHECK-NEXT: flat_store_byte v[10:11], v27 offset:12
; CHECK-NEXT: s_andn2_b64 exec, exec, s[12:13]
-; CHECK-NEXT: s_cbranch_execnz .LBB0_14
-; CHECK-NEXT: .LBB0_15: ; %Flow20
-; CHECK-NEXT: ; in Loop: Header=BB0_12 Depth=1
+; CHECK-NEXT: s_cbranch_execnz .LBB0_13
+; CHECK-NEXT: .LBB0_14: ; %Flow20
+; CHECK-NEXT: ; in Loop: Header=BB0_11 Depth=1
; CHECK-NEXT: s_or_b64 exec, exec, s[8:9]
; CHECK-NEXT: s_mov_b64 s[8:9], -1
-; CHECK-NEXT: s_cbranch_execz .LBB0_11
-; CHECK-NEXT: ; %bb.16: ; %loop-memcpy-residual-header5
-; CHECK-NEXT: ; in Loop: Header=BB0_12 Depth=1
+; CHECK-NEXT: s_cbranch_execz .LBB0_10
+; CHECK-NEXT: ; %bb.15: ; %loop-memcpy-residual-header5
+; CHECK-NEXT: ; in Loop: Header=BB0_11 Depth=1
; CHECK-NEXT: s_and_saveexec_b64 s[8:9], s[6:7]
; CHECK-NEXT: s_xor_b64 s[10:11], exec, s[8:9]
-; CHECK-NEXT: s_cbranch_execz .LBB0_10
-; CHECK-NEXT: ; %bb.17: ; %loop-memcpy-residual4.preheader
-; CHECK-NEXT: ; in Loop: Header=BB0_12 Depth=1
+; CHECK-NEXT: s_cbranch_execz .LBB0_9
+; CHECK-NEXT: ; %bb.16: ; %loop-memcpy-residual4.preheader
+; CHECK-NEXT: ; in Loop: Header=BB0_11 Depth=1
; CHECK-NEXT: s_mov_b64 s[12:13], 0
; CHECK-NEXT: s_mov_b64 s[14:15], 0
-; CHECK-NEXT: .LBB0_18: ; %loop-memcpy-residual4
-; CHECK-NEXT: ; Parent Loop BB0_12 Depth=1
+; CHECK-NEXT: .LBB0_17: ; %loop-memcpy-residual4
+; CHECK-NEXT: ; Parent Loop BB0_11 Depth=1
; CHECK-NEXT: ; => This Inner Loop Header: Depth=2
; CHECK-NEXT: v_mov_b32_e32 v12, s15
; CHECK-NEXT: v_add_co_u32_e32 v10, vcc, s14, v0
@@ -200,12 +198,12 @@ define void @issue63986(i64 %0, i64 %idxprom) {
; CHECK-NEXT: s_waitcnt vmcnt(0) lgkmcnt(0)
; CHECK-NEXT: flat_store_byte v[10:11], v13
; CHECK-NEXT: s_andn2_b64 exec, exec, s[12:13]
-; CHECK-NEXT: s_cbranch_execnz .LBB0_18
-; CHECK-NEXT: ; %bb.19: ; %Flow
-; CHECK-NEXT: ; in Loop: Header=BB0_12 Depth=1
+; CHECK-NEXT: s_cbranch_execnz .LBB0_17
+; CHECK-NEXT: ; %bb.18: ; %Flow
+; CHECK-NEXT: ; in Loop: Header=BB0_11 Depth=1
; CHECK-NEXT: s_or_b64 exec, exec, s[12:13]
-; CHECK-NEXT: s_branch .LBB0_10
-; CHECK-NEXT: .LBB0_20: ; %DummyReturnBlock
+; CHECK-NEXT: s_branch .LBB0_9
+; CHECK-NEXT: .LBB0_19: ; %DummyReturnBlock
; CHECK-NEXT: s_waitcnt vmcnt(0) lgkmcnt(0)
; CHECK-NEXT: s_setpc_b64 s[30:31]
entry:
diff --git a/llvm/test/Transforms/InstCombine/memcpy-from-global.ll b/llvm/test/Transforms/InstCombine/memcpy-from-global.ll
index ea9b16e1382ee90..da73f591ee3f250 100644
--- a/llvm/test/Transforms/InstCombine/memcpy-from-global.ll
+++ b/llvm/test/Transforms/InstCombine/memcpy-from-global.ll
@@ -118,7 +118,7 @@ define void @test2_addrspacecast() {
; CHECK-LABEL: @test2_addrspacecast(
; CHECK-NEXT: [[B:%.*]] = alloca [[T:%.*]], align 8
; CHECK-NEXT: [[B_CAST:%.*]] = addrspacecast ptr [[B]] to ptr addrspace(1)
-; CHECK-NEXT: call void @llvm.memcpy.p1.p1.i64(ptr addrspace(1) noundef align 4 dereferenceable(124) [[B_CAST]], ptr addrspace(1) noundef align 4 dereferenceable(124) addrspacecast (ptr @G to ptr addrspace(1)), i64 124, i1 false)
+; CHECK-NEXT: call void @llvm.memcpy.p1.p1.i64(ptr addrspace(1) noundef align 8 dereferenceable(124) [[B_CAST]], ptr addrspace(1) noundef align 16 dereferenceable(124) addrspacecast (ptr @G to ptr addrspace(1)), i64 124, i1 false)
; CHECK-NEXT: call void @bar_as1(ptr addrspace(1) [[B_CAST]])
; CHECK-NEXT: ret void
;
@@ -234,7 +234,7 @@ define void @test8() {
define void @test8_addrspacecast() {
; CHECK-LABEL: @test8_addrspacecast(
; CHECK-NEXT: [[AL:%.*]] = alloca [[U:%.*]], align 16
-; CHECK-NEXT: call void @llvm.memcpy.p0.p1.i64(ptr noundef nonnull align 16 dereferenceable(20) [[AL]], ptr addrspace(1) noundef align 4 dereferenceable(20) addrspacecast (ptr getelementptr inbounds ([2 x %U], ptr @H, i64 0, i64 1) to ptr addrspace(1)), i64 20, i1 false)
+; CHECK-NEXT: call void @llvm.memcpy.p0.p1.i64(ptr noundef nonnull align 16 dereferenceable(20) [[AL]], ptr addrspace(1) noundef nonnull align 4 dereferenceable(20) addrspacecast (ptr getelementptr inbounds ([2 x %U], ptr @H, i64 0, i64 1) to ptr addrspace(1)), i64 20, i1 false)
; CHECK-NEXT: call void @bar(ptr nonnull [[AL]]) #[[ATTR3]]
; CHECK-NEXT: ret void
;
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