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Diffstat (limited to 'test/CodeGen/X86/2010-05-03-CoalescerSubRegClobber.ll')
| -rw-r--r-- | test/CodeGen/X86/2010-05-03-CoalescerSubRegClobber.ll | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/test/CodeGen/X86/2010-05-03-CoalescerSubRegClobber.ll b/test/CodeGen/X86/2010-05-03-CoalescerSubRegClobber.ll new file mode 100644 index 0000000000000..323925c7ff68e --- /dev/null +++ b/test/CodeGen/X86/2010-05-03-CoalescerSubRegClobber.ll @@ -0,0 +1,33 @@ +; RUN: llc < %s | FileCheck %s +; PR6941 +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 i32 @snd_xbytes(i32 %v, i32 %from, i32 %to) nounwind readnone ssp { +entry: + %cmp19 = icmp eq i32 %to, 0 ; <i1> [#uses=1] + br i1 %cmp19, label %while.end, label %while.cond + +while.cond: ; preds = %entry, %while.cond + %y.021 = phi i32 [ %rem, %while.cond ], [ %to, %entry ] ; <i32> [#uses=3] + %x.020 = phi i32 [ %y.021, %while.cond ], [ %from, %entry ] ; <i32> [#uses=1] + %rem = urem i32 %x.020, %y.021 ; <i32> [#uses=2] + %cmp = icmp eq i32 %rem, 0 ; <i1> [#uses=1] + br i1 %cmp, label %while.end, label %while.cond + +while.end: ; preds = %while.cond, %entry + %x.0.lcssa = phi i32 [ %from, %entry ], [ %y.021, %while.cond ] ; <i32> [#uses=2] + %div = udiv i32 %from, %x.0.lcssa ; <i32> [#uses=1] + %div11 = udiv i32 %to, %x.0.lcssa ; <i32> [#uses=1] + %conv = zext i32 %v to i64 ; <i64> [#uses=1] + %conv14 = zext i32 %div11 to i64 ; <i64> [#uses=1] +; Verify that we don't clobber %eax after putting the imulq result in %rax +; CHECK: imulq %r{{.}}x, %r[[RES:.]]x +; CHECK-NOT: movl {{.*}}, %e[[RES]]x +; CHECK: div + %mul = mul i64 %conv14, %conv ; <i64> [#uses=1] + %conv16 = zext i32 %div to i64 ; <i64> [#uses=1] + %div17 = udiv i64 %mul, %conv16 ; <i64> [#uses=1] + %conv18 = trunc i64 %div17 to i32 ; <i32> [#uses=1] + ret i32 %conv18 +} |