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