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| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2010-03-04 20:42:07 +0000 |
|---|---|---|
| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2010-03-04 20:42:07 +0000 |
| commit | 3cfe01072c460ea2a8f80b99b9a77699bf6441d6 (patch) | |
| tree | 303c6f966a5b78711ae4c45f49c998159c37a747 /test/CodeGen/X86/2010-03-04-Mul8Bug.ll | |
| parent | 0ef701e6ae816b0360e0a66e8b815ff875fe2a32 (diff) | |
Fix the remaining MUL8 and DIV8 to define AX instead of AL,AH.
These instructions technically define AL,AH, but a trick in X86ISelDAGToDAG
reads AX in order to avoid reading AH with a REX instruction.
Fix PR6489.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97742 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/X86/2010-03-04-Mul8Bug.ll')
| -rw-r--r-- | test/CodeGen/X86/2010-03-04-Mul8Bug.ll | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/test/CodeGen/X86/2010-03-04-Mul8Bug.ll b/test/CodeGen/X86/2010-03-04-Mul8Bug.ll new file mode 100644 index 0000000000..48e75e9572 --- /dev/null +++ b/test/CodeGen/X86/2010-03-04-Mul8Bug.ll @@ -0,0 +1,25 @@ +; RUN: llc < %s +; PR6489 +; +; This test case produces a MUL8 instruction and then tries to read the result +; from the AX register instead of AH/AL. That confuses live interval analysis. +; +target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64" +target triple = "x86_64-apple-darwin10.0.0" + +define void @func_56(i64 %p_57, i32*** %p_58) nounwind ssp { +for.end: + %conv49 = trunc i32 undef to i8 ; <i8> [#uses=1] + %div.i = udiv i8 %conv49, 5 ; <i8> [#uses=1] + %conv51 = zext i8 %div.i to i32 ; <i32> [#uses=1] + %call55 = call i32 @qux(i32 undef, i32 -2) nounwind ; <i32> [#uses=1] + %rem.i = urem i32 %call55, -1 ; <i32> [#uses=1] + %cmp57 = icmp uge i32 %conv51, %rem.i ; <i1> [#uses=1] + %conv58 = zext i1 %cmp57 to i32 ; <i32> [#uses=1] + %call85 = call i32 @func_35(i32*** undef, i32 undef, i32 %conv58, i32 1247, i32 0) nounwind ; <i32> [#uses=0] + ret void +} + +declare i32 @func_35(i32***, i32, i32, i32, i32) + +declare i32 @qux(i32, i32) |