derek.holloway
7502bf64a4
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67 lines
2.0 KiB
LLVM
67 lines
2.0 KiB
LLVM
; RUN: opt -S -passes=instcombine < %s | FileCheck %s
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@c = common global i8 0, align 1
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@a = common global i8 0, align 1
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@b = common global i8 0, align 1
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define void @func() nounwind uwtable ssp {
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entry:
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%0 = load i8, ptr @c, align 1
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%conv = zext i8 %0 to i32
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%or = or i32 %conv, 1
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%conv1 = trunc i32 %or to i8
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store i8 %conv1, ptr @a, align 1
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%conv2 = zext i8 %conv1 to i32
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%neg = xor i32 %conv2, -1
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%and = and i32 1, %neg
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%conv3 = trunc i32 %and to i8
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store i8 %conv3, ptr @b, align 1
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%1 = load i8, ptr @a, align 1
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%conv4 = zext i8 %1 to i32
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%conv5 = zext i8 %conv3 to i32
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%tobool = icmp ne i32 %conv4, 0
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br i1 %tobool, label %land.rhs, label %land.end
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land.rhs: ; preds = %entry
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%tobool8 = icmp ne i32 %conv5, 0
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br label %land.end
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land.end: ; preds = %land.rhs, %entry
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%2 = phi i1 [ false, %entry ], [ %tobool8, %land.rhs ]
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%land.ext = zext i1 %2 to i32
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%mul = mul nsw i32 3, %land.ext
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%conv9 = trunc i32 %mul to i8
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store i8 %conv9, ptr @a, align 1
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ret void
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; CHECK-LABEL: @func(
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; CHECK-NOT: select
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}
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define i1 @select_no_infinite_loop(i2 %arg0, i2 %arg1, i1 %arg2, i2 %arg3) {
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; CHECK-LABEL: define i1 @select_no_infinite_loop(
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; CHECK-SAME: i2 [[ARG0:%.*]], i2 [[ARG1:%.*]], i1 [[ARG2:%.*]], i2 [[ARG3:%.*]]) {
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; CHECK-NEXT: [[ENTRY:.*:]]
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; CHECK-NEXT: [[DOTFR:%.*]] = freeze i2 [[ARG3]]
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; CHECK-NEXT: [[I:%.*]] = icmp ne i2 [[DOTFR]], -1
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; CHECK-NEXT: ret i1 [[I]]
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;
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entry:
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%cmp0 = icmp sgt i2 0, %arg0
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%zext = zext i1 %arg2 to i2
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%sel0 = select i1 %cmp0, i2 0, i2 %zext
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%trunc = trunc i2 %sel0 to i1
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%sel1 = select i1 %trunc, i2 %arg1, i2 0
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%cmp1 = icmp sle i1 %cmp0, %trunc
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%sel2 = select i1 %cmp1, i2 0, i2 %arg1
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%and = and i2 %zext, %sel2
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%sel3 = select i1 %arg2, i2 0, i2 %arg3
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%div = sdiv i2 1, %sel3
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%cmp2 = icmp uge i2 %sel1, %and
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%sext = sext i1 %cmp2 to i2
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%cmp3 = icmp sgt i2 %div, %sext
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%cmp4 = icmp sgt i2 %sel0, 0
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%lshr = lshr i1 %cmp3, %cmp4
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ret i1 %lshr
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}
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