forked from OSchip/llvm-project
55 lines
1.7 KiB
LLVM
55 lines
1.7 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -O2 -S < %s | FileCheck %s
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; Given an "expect" on a compare, we should not combine
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; that compare with other instructions in a way that the
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; backend can't undo. Expect lowering becomes metadata,
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; and passes like SimplifyCFG should respect that.
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define void @PR49336(i32 %delta, i32 %tag_type, ptr %ip) {
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; CHECK-LABEL: @PR49336(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32 [[DELTA:%.*]], 0
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; CHECK-NEXT: br i1 [[CMP]], label [[IF_THEN:%.*]], label [[IF_END3:%.*]], !prof !0
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; CHECK: if.then:
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; CHECK-NEXT: [[CMP1_NOT:%.*]] = icmp eq i32 [[TAG_TYPE:%.*]], 0
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; CHECK-NEXT: br i1 [[CMP1_NOT]], label [[IF_END3]], label [[IF_THEN2:%.*]]
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; CHECK: if.then2:
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; CHECK-NEXT: store i8 42, ptr [[IP:%.*]], align 1
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; CHECK-NEXT: br label [[IF_END3]]
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; CHECK: if.end3:
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; CHECK-NEXT: ret void
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;
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entry:
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%delta.addr = alloca i32, align 4
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%tag_type.addr = alloca i32, align 4
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%ip.addr = alloca ptr, align 8
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store i32 %delta, ptr %delta.addr, align 4
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store i32 %tag_type, ptr %tag_type.addr, align 4
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store ptr %ip, ptr %ip.addr, align 8
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%0 = load i32, ptr %delta.addr, align 4
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%cmp = icmp slt i32 %0, 0
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%conv = zext i1 %cmp to i64
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%expval = call i64 @llvm.expect.i64(i64 %conv, i64 0)
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%tobool = icmp ne i64 %expval, 0
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br i1 %tobool, label %if.then, label %if.end3
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if.then:
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%1 = load i32, ptr %tag_type.addr, align 4
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%cmp1 = icmp ne i32 %1, 0
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br i1 %cmp1, label %if.then2, label %if.end
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if.then2:
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%2 = load ptr, ptr %ip.addr, align 8
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store i8 42, ptr %2, align 1
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br label %if.end
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if.end:
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br label %if.end3
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if.end3:
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ret void
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}
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declare i64 @llvm.expect.i64(i64, i64)
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