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| author | Sanjay Patel <spatel@rotateright.com> | 2016-05-09 17:31:55 +0000 |
|---|---|---|
| committer | Sanjay Patel <spatel@rotateright.com> | 2016-05-09 17:31:55 +0000 |
| commit | c7b91e65d8960da9e9fb6a3d044f7da71d5879fa (patch) | |
| tree | f683b451658c8243ab494eb9ae7b646ba9da9ecd /llvm/test/CodeGen/X86/cmov-into-branch.ll | |
| parent | b5935bfd7dda5ce37f57f3f1902eb6855d948738 (diff) | |
| download | bcm5719-llvm-c7b91e65d8960da9e9fb6a3d044f7da71d5879fa.tar.gz bcm5719-llvm-c7b91e65d8960da9e9fb6a3d044f7da71d5879fa.zip | |
[CGP] avoid crashing from weightlessness
It's possible that we have branch weights with 0 values.
In that case, don't try to create an impossible BranchProbability.
llvm-svn: 268935
Diffstat (limited to 'llvm/test/CodeGen/X86/cmov-into-branch.ll')
| -rw-r--r-- | llvm/test/CodeGen/X86/cmov-into-branch.ll | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/X86/cmov-into-branch.ll b/llvm/test/CodeGen/X86/cmov-into-branch.ll index 35c1d3498a5..acb5a2bb51f 100644 --- a/llvm/test/CodeGen/X86/cmov-into-branch.ll +++ b/llvm/test/CodeGen/X86/cmov-into-branch.ll @@ -114,8 +114,22 @@ define i32 @weighted_select3(i32 %a, i32 %b) { ret i32 %sel } +; Weightlessness is no reason to die. +define i32 @unweighted_select(i32 %a, i32 %b) { +; CHECK-LABEL: unweighted_select: +; CHECK: # BB#0: +; CHECK-NEXT: testl %edi, %edi +; CHECK-NEXT: cmovnel %edi, %esi +; CHECK-NEXT: movl %esi, %eax +; CHECK-NEXT: retq +; + %cmp = icmp ne i32 %a, 0 + %sel = select i1 %cmp, i32 %a, i32 %b, !prof !3 + ret i32 %sel +} !0 = !{!"branch_weights", i32 1, i32 99} !1 = !{!"branch_weights", i32 1, i32 100} !2 = !{!"branch_weights", i32 100, i32 1} +!3 = !{!"branch_weights", i32 0, i32 0} |
