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Diffstat (limited to 'test/CodeGen/X86/constant-hoisting-cmp.ll')
| -rw-r--r-- | test/CodeGen/X86/constant-hoisting-cmp.ll | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/test/CodeGen/X86/constant-hoisting-cmp.ll b/test/CodeGen/X86/constant-hoisting-cmp.ll new file mode 100644 index 000000000000..4e9e49487287 --- /dev/null +++ b/test/CodeGen/X86/constant-hoisting-cmp.ll @@ -0,0 +1,25 @@ +; RUN: llc < %s -O3 -march=x86-64 |FileCheck %s +define i64 @foo(i64 %data1, i64 %data2, i64 %data3) +{ +; If constant 4294967295 is hoisted to a variable, then we won't be able to +; use a shift right by 32 to optimize the compare. +entry: + %val1 = add i64 %data3, 1 + %x = icmp ugt i64 %data1, 4294967295 + br i1 %x, label %End, label %L_val2 + +; CHECK: shrq $32, {{.*}} +; CHECK: shrq $32, {{.*}} +L_val2: + %val2 = add i64 %data3, 2 + %y = icmp ugt i64 %data2, 4294967295 + br i1 %y, label %End, label %L_val3 + +L_val3: + %val3 = add i64 %data3, 3 + br label %End + +End: + %p1 = phi i64 [%val1,%entry], [%val2,%L_val2], [%val3,%L_val3] + ret i64 %p1 +} |