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use SUBREG_TO_REG instead of INSERT_SUBREG, this way the code

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generator can know the top bits are zero, not undefined.
Thanks to Dan for pointing this out.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75899 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-07-16 06:31:37 +00:00
parent 115934eb57
commit 6ef40b11f8
1 changed files with 1 additions and 1 deletions
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2
lib/Target/X86/X86Instr64bit.td
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@ -1309,7 +1309,7 @@ def Int_CVTTSS2SI64rm: RSSI<0x2C, MRMSrcMem, (outs GR64:$dst), (ins f32mem:$src)
// when we have a better way to specify isel priority.
let AddedComplexity = 1 in
def : Pat<(i64 0),
(INSERT_SUBREG (i64 (IMPLICIT_DEF)), (MOV32r0), x86_subreg_32bit)>;
(SUBREG_TO_REG (i64 0), (MOV32r0), x86_subreg_32bit)>;
// Materialize i64 constant where top 32-bits are zero.