[PATCH] D107453: [SVE] Add folds for truncation of vscale
Dylan Fleming via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Fri Aug 13 02:18:31 PDT 2021
This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rG4be7fb976228: [SVE] Add folds for truncation of vscale (authored by DylanFleming-arm).
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D107453/new/
https://reviews.llvm.org/D107453
Files:
llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp
llvm/test/Transforms/InstCombine/vscale_trunc.ll
Index: llvm/test/Transforms/InstCombine/vscale_trunc.ll
===================================================================
--- /dev/null
+++ llvm/test/Transforms/InstCombine/vscale_trunc.ll
@@ -0,0 +1,40 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -instcombine -S | FileCheck %s
+
+define i8 @vscale_trunc_i32toi8() vscale_range(0, 255) {
+; CHECK-LABEL: @vscale_trunc_i32toi8(
+; CHECK-NEXT: entry:
+; CHECK-NEXT: [[TMP0:%.*]] = call i8 @llvm.vscale.i8()
+; CHECK-NEXT: ret i8 [[TMP0]]
+entry:
+ %0 = call i32 @llvm.vscale.i32()
+ %1 = trunc i32 %0 to i8
+ ret i8 %1
+}
+
+
+define i8 @vscale_trunc_i32toi8_poison() vscale_range(0, 256) {
+; CHECK-LABEL: @vscale_trunc_i32toi8_poison(
+; CHECK-NEXT: entry:
+; CHECK-NEXT: [[TMP0:%.*]] = call i32 @llvm.vscale.i32()
+; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[TMP0]] to i8
+; CHECK-NEXT: ret i8 [[TMP1]]
+ entry:
+ %0 = call i32 @llvm.vscale.i32()
+ %1 = trunc i32 %0 to i8
+ ret i8 %1
+}
+
+define i8 @vscale_trunc_i32toi8_noAttr() {
+; CHECK-LABEL: @vscale_trunc_i32toi8_noAttr(
+; CHECK-NEXT: entry:
+; CHECK-NEXT: [[TMP0:%.*]] = call i32 @llvm.vscale.i32()
+; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[TMP0]] to i8
+; CHECK-NEXT: ret i8 [[TMP1]]
+ entry:
+ %0 = call i32 @llvm.vscale.i32()
+ %1 = trunc i32 %0 to i8
+ ret i8 %1
+}
+
+declare i32 @llvm.vscale.i32()
Index: llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp
===================================================================
--- llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp
+++ llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp
@@ -961,6 +961,20 @@
return BinaryOperator::CreateAdd(NarrowCtlz, WidthDiff);
}
}
+
+ if (match(Src, m_VScale(DL))) {
+ if (Trunc.getFunction()->hasFnAttribute(Attribute::VScaleRange)) {
+ unsigned MaxVScale = Trunc.getFunction()
+ ->getFnAttribute(Attribute::VScaleRange)
+ .getVScaleRangeArgs()
+ .second;
+ if (MaxVScale > 0 && Log2_32(MaxVScale) < DestWidth) {
+ Value *VScale = Builder.CreateVScale(ConstantInt::get(DestTy, 1));
+ return replaceInstUsesWith(Trunc, VScale);
+ }
+ }
+ }
+
return nullptr;
}
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