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; RUN: opt -S -gvn < %s | FileCheck %s
define i32 @sadd1(i32 %a, i32 %b) #0 {
; CHECK-LABEL: @sadd1(
entry:
%sadd = tail call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 %a, i32 %b)
%cmp = extractvalue { i32, i1 } %sadd, 1
br i1 %cmp, label %if.then, label %if.end
if.then: ; preds = %entry
ret i32 42
if.end: ; preds = %entry
%sadd3 = add i32 %a, %b
ret i32 %sadd3
; CHECK-NOT: add i32 %a, %b
; CHECK: %sadd3.repl = extractvalue { i32, i1 } %sadd, 0
; CHECK: ret i32 %sadd3.repl
}
define i32 @sadd2(i32 %a, i32 %b) #0 {
entry:
%sadd3 = add i32 %a, %b
%sadd = tail call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 %a, i32 %b)
%cmp = extractvalue { i32, i1 } %sadd, 1
br i1 %cmp, label %if.then, label %if.end
; CHECK-NOT: %sadd3 = add i32 %a, %b
; CHECK: %sadd.repl = tail call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 %a, i32 %b)
; CHECK-NOT: %sadd = tail call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 %a, i32 %b)
; CHECK: %sadd3.repl = extractvalue { i32, i1 } %sadd.repl, 0
if.then: ; preds = %entry
%sadd4 = add i32 %sadd3, 1
ret i32 %sadd4
; CHECK: %sadd4 = add i32 %sadd3.repl, 1
if.end: ; preds = %entry
ret i32 %sadd3
; CHECK: ret i32 %sadd3.repl
}
; Check if PRE does not crash
define i32 @pre(i32 %a, i32 %b) nounwind ssp uwtable {
entry:
%cmp = icmp sgt i32 %a, 42
br i1 %cmp, label %if.then, label %if.end3
if.then: ; preds = %entry
%add = call {i32, i1} @llvm.sadd.with.overflow.i32(i32 %a, i32 %b)
%add1 = extractvalue {i32, i1} %add, 0
%o = extractvalue {i32, i1} %add, 1
%o32 = zext i1 %o to i32
%add32 = add i32 %add1, %o32
%cmp1 = icmp sgt i32 %add1, 42
br i1 %cmp1, label %if.then2, label %if.end3
if.then2: ; preds = %if.then
call void @abort() noreturn
unreachable
if.end3: ; preds = %if.end, %entry
%add4 = add i32 %a, %b
ret i32 %add4
}
declare void @abort() noreturn
declare { i32, i1 } @llvm.sadd.with.overflow.i32(i32, i32) nounwind readnone
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