cond_br.ll
1.55 KB
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; RUN: opt -basicaa -newgvn -S < %s | FileCheck %s
@y = external global i32
@z = external global i32
; Function Attrs: nounwind ssp uwtable
define void @foo(i32 %x) {
; CHECK: @foo(i32 %x)
; CHECK: %.pre = load i32, i32* @y
; CHECK: call void @bar(i32 %.pre)
%t = sub i32 %x, %x
%.pre = load i32, i32* @y, align 4
%cmp = icmp sgt i32 %t, 2
br i1 %cmp, label %if.then, label %entry.if.end_crit_edge
entry.if.end_crit_edge: ; preds = %entry
br label %if.end
if.then: ; preds = %entry
%add = add nsw i32 %x, 3
store i32 %add, i32* @y, align 4
br label %if.end
if.end: ; preds = %entry.if.end_crit_edge, %if.then
%1 = phi i32 [ %.pre, %entry.if.end_crit_edge ], [ %add, %if.then ]
tail call void @bar(i32 %1)
ret void
}
define void @foo2(i32 %x) {
; CHECK: @foo2(i32 %x)
; CHECK: %.pre = load i32, i32* @y
; CHECK: tail call void @bar(i32 %.pre)
entry:
%t = sub i32 %x, %x
%.pre = load i32, i32* @y, align 4
%cmp = icmp sgt i32 %t, 2
br i1 %cmp, label %if.then, label %if.else
if.then: ; preds = %entry
%add = add nsw i32 %x, 3
store i32 %add, i32* @y, align 4
br label %if.end
if.else: ; preds = %entry
store i32 1, i32* @z, align 4
br label %if.end
if.end: ; preds = %if.else, %if.then
%0 = phi i32 [ %.pre, %if.else ], [ %add, %if.then ]
tail call void @bar(i32 %0)
ret void
}
declare void @bar(i32)