bd1a4c8565
A llvm.vscale will always be at least 1, never zero. Teaching that to isKnownNonZero can help fold away some statically known compares. Differential Revision: https://reviews.llvm.org/D128217
27 lines
559 B
LLVM
27 lines
559 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -passes=instcombine -S | FileCheck %s
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define i1 @iszero() {
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; CHECK-LABEL: @iszero(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: ret i1 false
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;
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entry:
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%0 = call i32 @llvm.vscale.i32()
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%1 = icmp eq i32 %0, 0
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ret i1 %1
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}
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define i1 @iszero_range() vscale_range(1,16) {
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; CHECK-LABEL: @iszero_range(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: ret i1 false
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;
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entry:
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%0 = call i32 @llvm.vscale.i32()
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%1 = icmp eq i32 %0, 0
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ret i1 %1
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}
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declare i32 @llvm.vscale.i32()
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