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we compile multiply-by-constant into horrible code. Doesn't sse4 have some
instruction for doing this? git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51473 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -807,3 +807,41 @@ foo1:
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//===---------------------------------------------------------------------===//
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We compile vector multiply-by-constant into poor code:
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define <4 x i32> @f(<4 x i32> %i) nounwind {
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%A = mul <4 x i32> %i, < i32 10, i32 10, i32 10, i32 10 >
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ret <4 x i32> %A
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}
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Compiles into:
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LCPI1_0: ## <4 x i32>
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.long 10
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.long 10
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.long 10
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.long 10
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.text
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.align 4,0x90
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.globl _f
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_f:
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pshufd $3, %xmm0, %xmm1
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movd %xmm1, %eax
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imull LCPI1_0+12, %eax
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movd %eax, %xmm1
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pshufd $1, %xmm0, %xmm2
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movd %xmm2, %eax
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imull LCPI1_0+4, %eax
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movd %eax, %xmm2
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punpckldq %xmm1, %xmm2
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movd %xmm0, %eax
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imull LCPI1_0, %eax
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movd %eax, %xmm1
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movhlps %xmm0, %xmm0
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movd %xmm0, %eax
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imull LCPI1_0+8, %eax
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movd %eax, %xmm0
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punpckldq %xmm0, %xmm1
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movaps %xmm1, %xmm0
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punpckldq %xmm2, %xmm0
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ret
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