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d1980a5acd
related transformations out of target-specific dag combine into the
ARM backend. These were added by Evan in r37685 with no testcases
and only seems to help ARM (e.g. test/CodeGen/ARM/select_xform.ll).
Add some simple X86-specific (for now) DAG combines that turn things
like cond ? 8 : 0 -> (zext(cond) << 3). This happens frequently
with the recently added cp constant select optimization, but is a
very general xform. For example, we now compile the second example
in const-select.ll to:
_test:
movsd LCPI2_0, %xmm0
ucomisd 8(%esp), %xmm0
seta %al
movzbl %al, %eax
movl 4(%esp), %ecx
movsbl (%ecx,%eax,4), %eax
ret
instead of:
_test:
movl 4(%esp), %eax
leal 4(%eax), %ecx
movsd LCPI2_0, %xmm0
ucomisd 8(%esp), %xmm0
cmovbe %eax, %ecx
movsbl (%ecx), %eax
ret
This passes multisource and dejagnu.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66779 91177308-0d34-0410-b5e6-96231b3b80d8
25 lines
684 B
LLVM
25 lines
684 B
LLVM
; RUN: llvm-as < %s | llc -march=x86 | grep 24576
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; PR2135
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32"
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target triple = "i386-pc-linux-gnu"
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@.str = constant [13 x i8] c"c45531m.adb\00\00"
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define void @main() nounwind {
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entry:
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%tmp1 = call i1 @report__equal( i32 3, i32 3 )
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%b.0 = select i1 %tmp1, i64 35184372088832, i64 0
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%tmp7 = mul i64 3, %b.0
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%tmp32 = icmp eq i64 %tmp7, 105553116266496
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br i1 %tmp32, label %return, label %bb35
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bb35:
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call void @abort( )
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unreachable
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return:
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ret void
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}
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declare i1 @report__equal(i32 %x, i32 %y) nounwind;
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declare void @abort()
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