35 lines
1.0 KiB
LLVM
35 lines
1.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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;
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; Test that the fls library call simplifier works correctly even for
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; targets with 16-bit int. Although fls is available on a number of
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; targets it's supported (hardcoded as available) only on FreeBSD.
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;
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; RUN: opt < %s -mtriple=avr-freebsd -passes=instcombine -S | FileCheck %s
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; RUN: opt < %s -mtriple=msp430-freebsd -passes=instcombine -S | FileCheck %s
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declare i16 @fls(i16)
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declare void @sink(i16)
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define void @fold_fls(i16 %x) {
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; CHECK-LABEL: @fold_fls(
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; CHECK-NEXT: call void @sink(i16 0)
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; CHECK-NEXT: call void @sink(i16 1)
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; CHECK-NEXT: [[CTLZ:%.*]] = call i16 @llvm.ctlz.i16(i16 [[X:%.*]], i1 false), !range [[RNG0:![0-9]+]]
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; CHECK-NEXT: [[TMP1:%.*]] = sub nuw nsw i16 16, [[CTLZ]]
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; CHECK-NEXT: call void @sink(i16 [[TMP1]])
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; CHECK-NEXT: ret void
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;
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%n0 = call i16 @fls(i16 0)
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call void @sink(i16 %n0)
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%n1 = call i16 @fls(i16 1)
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call void @sink(i16 %n1)
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%nx = call i16 @fls(i16 %x)
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call void @sink(i16 %nx)
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ret void
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}
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