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https://github.com/c64scene-ar/llvm-6502.git
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babae05237
The problem this time seems to be a thinko. We were assuming that in the CFG A | \ | B | / C speculating the basic block B would cause only the phi value for the B->C edge to be speculated. That is not true, the phi's are semantically in the edges, so if the A->B->C path is taken, any code needed for A->C is not executed and we have to consider it too when deciding to speculate B. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183226 91177308-0d34-0410-b5e6-96231b3b80d8
29 lines
803 B
LLVM
29 lines
803 B
LLVM
; RUN: opt < %s -simplifycfg -S | FileCheck %s
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@b = extern_weak global i32
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define i32 @foo(i1 %y) {
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; CHECK: define i32 @foo(i1 %y) {
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br i1 %y, label %bb1, label %bb2
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bb1:
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br label %bb3
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bb2:
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br label %bb3
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bb3:
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%cond.i = phi i32 [ 0, %bb1 ], [ srem (i32 1, i32 zext (i1 icmp eq (i32* @b, i32* null) to i32)), %bb2 ]
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; CHECK: phi i32 {{.*}} srem (i32 1, i32 zext (i1 icmp eq (i32* @b, i32* null) to i32)), %bb2
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ret i32 %cond.i
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}
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define i32 @foo2(i1 %x) {
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; CHECK: define i32 @foo2(i1 %x) {
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bb0:
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br i1 %x, label %bb1, label %bb2
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bb1:
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br label %bb2
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bb2:
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%cond = phi i32 [ 0, %bb1 ], [ srem (i32 1, i32 zext (i1 icmp eq (i32* @b, i32* null) to i32)), %bb0 ]
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; CHECK: %cond = phi i32 [ 0, %bb1 ], [ srem (i32 1, i32 zext (i1 icmp eq (i32* @b, i32* null) to i32)), %bb0 ]
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ret i32 %cond
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}
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