[llvm] 1ce3f94 - {RISCV] Test coverage for improved lowering assuming vscale is pow-of-two

[Philip Reames via llvm-commits]

Author: Philip Reames
Date: 2022-07-12T15:40:30-07:00
New Revision: 1ce3f94570eb8cca5c63a29268973bd352161c0b

URL: https://github.com/llvm/llvm-project/commit/1ce3f94570eb8cca5c63a29268973bd352161c0b
DIFF: https://github.com/llvm/llvm-project/commit/1ce3f94570eb8cca5c63a29268973bd352161c0b.diff

LOG: {RISCV] Test coverage for improved lowering assuming vscale is pow-of-two

Added: 
    llvm/test/CodeGen/RISCV/rvv/vscale-power-of-two.ll

Modified: 
    

Removed: 
    


################################################################################
diff  --git a/llvm/test/CodeGen/RISCV/rvv/vscale-power-of-two.ll b/llvm/test/CodeGen/RISCV/rvv/vscale-power-of-two.ll
new file mode 100644
index 0000000000000..3d42224655169
--- /dev/null
+++ b/llvm/test/CodeGen/RISCV/rvv/vscale-power-of-two.ll
@@ -0,0 +1,102 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -mtriple=riscv64 -mattr=+v,+m -verify-machineinstrs < %s | FileCheck %s
+; RUN: llc -mtriple=riscv64 -mattr=+Zve64x,+m -verify-machineinstrs < %s | FileCheck %s
+declare i64 @llvm.vscale.i64()
+
+define i64 @vscale_lshr(i64 %TC) {
+; CHECK-LABEL: vscale_lshr:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    csrr a1, vlenb
+; CHECK-NEXT:    srli a1, a1, 6
+; CHECK-NEXT:    remu a0, a0, a1
+; CHECK-NEXT:    ret
+  %vscale = call i64 @llvm.vscale.i64()
+  %shifted = lshr i64 %vscale, 3
+  %urem = urem i64 %TC, %shifted
+  ret i64 %urem
+}
+
+define i64 @vscale(i64 %TC) {
+; CHECK-LABEL: vscale:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    csrr a1, vlenb
+; CHECK-NEXT:    srli a1, a1, 3
+; CHECK-NEXT:    remu a0, a0, a1
+; CHECK-NEXT:    ret
+  %vscale = call i64 @llvm.vscale.i64()
+  %urem = urem i64 %TC, %vscale
+  ret i64 %urem
+}
+
+define i64 @vscale_shl(i64 %TC) {
+; CHECK-LABEL: vscale_shl:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    csrr a1, vlenb
+; CHECK-NEXT:    remu a0, a0, a1
+; CHECK-NEXT:    ret
+  %vscale = call i64 @llvm.vscale.i64()
+  %shifted = shl i64 %vscale, 3
+  %urem = urem i64 %TC, %shifted
+  ret i64 %urem
+}
+
+define i64 @TC_minus_rem(i64 %TC) {
+; CHECK-LABEL: TC_minus_rem:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    csrr a1, vlenb
+; CHECK-NEXT:    srli a1, a1, 3
+; CHECK-NEXT:    remu a1, a0, a1
+; CHECK-NEXT:    sub a0, a0, a1
+; CHECK-NEXT:    ret
+  %vscale = call i64 @llvm.vscale.i64()
+  %urem = urem i64 %TC, %vscale
+  %VTC = sub i64 %TC, %urem
+  ret i64 %VTC
+}
+
+define i64 @TC_minus_rem_shl(i64 %TC) {
+; CHECK-LABEL: TC_minus_rem_shl:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    csrr a1, vlenb
+; CHECK-NEXT:    remu a1, a0, a1
+; CHECK-NEXT:    sub a0, a0, a1
+; CHECK-NEXT:    ret
+  %vscale = call i64 @llvm.vscale.i64()
+  %shifted = shl i64 %vscale, 3
+  %urem = urem i64 %TC, %shifted
+  %VTC = sub i64 %TC, %urem
+  ret i64 %VTC
+}
+
+define i64 @con1024_minus_rem() {
+; CHECK-LABEL: con1024_minus_rem:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    csrr a0, vlenb
+; CHECK-NEXT:    srli a0, a0, 3
+; CHECK-NEXT:    li a1, 1024
+; CHECK-NEXT:    remu a0, a1, a0
+; CHECK-NEXT:    sub a0, a1, a0
+; CHECK-NEXT:    ret
+  %vscale = call i64 @llvm.vscale.i64()
+  %urem = urem i64 1024, %vscale
+  %VTC = sub i64 1024, %urem
+  ret i64 %VTC
+}
+
+; Maximum VLEN=64k implies Maximum vscale=1024.
+; TODO: This should fold to 2048
+define i64 @con2048_minus_rem() {
+; CHECK-LABEL: con2048_minus_rem:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    csrr a0, vlenb
+; CHECK-NEXT:    srli a0, a0, 3
+; CHECK-NEXT:    lui a1, 1
+; CHECK-NEXT:    addiw a1, a1, -2048
+; CHECK-NEXT:    remu a0, a1, a0
+; CHECK-NEXT:    sub a0, a1, a0
+; CHECK-NEXT:    ret
+  %vscale = call i64 @llvm.vscale.i64()
+  %urem = urem i64 2048, %vscale
+  %VTC = sub i64 2048, %urem
+  ret i64 %VTC
+}