forked from OSchip/llvm-project
31 lines
1.1 KiB
LLVM
31 lines
1.1 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -simplifycfg -S | FileCheck %s
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; Reduced from arm_abs_q31() from CMSIS DSP suite.
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; https://reviews.llvm.org/D65148#1629010
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define i32 @abs_with_clamp(i32 %arg) {
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; CHECK-LABEL: @abs_with_clamp(
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; CHECK-NEXT: begin:
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; CHECK-NEXT: [[IS_POSITIVE:%.*]] = icmp sgt i32 [[ARG:%.*]], 0
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; CHECK-NEXT: [[IS_INT_MIN:%.*]] = icmp eq i32 [[ARG]], -2147483648
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; CHECK-NEXT: [[NEGATED:%.*]] = sub nsw i32 0, [[ARG]]
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; CHECK-NEXT: [[ABS:%.*]] = select i1 [[IS_INT_MIN]], i32 2147483647, i32 [[NEGATED]]
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; CHECK-NEXT: [[TMP6:%.*]] = select i1 [[IS_POSITIVE]], i32 [[ARG]], i32 [[ABS]]
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; CHECK-NEXT: ret i32 [[TMP6]]
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;
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begin:
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%is_positive = icmp sgt i32 %arg, 0
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br i1 %is_positive, label %end, label %negative
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negative: ; preds = %begin
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%is_int_min = icmp eq i32 %arg, -2147483648
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%negated = sub nsw i32 0, %arg
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%abs = select i1 %is_int_min, i32 2147483647, i32 %negated
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br label %end
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end: ; preds = %negative, %begin
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%tmp6 = phi i32 [ %arg, %begin ], [ %abs, %negative ]
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ret i32 %tmp6
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}
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