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Fixed a number of issues related to memory alignment; a number of places

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were expecting vector-width-aligned pointers where in point of fact,
there's no guarantee that they would have been in general.

Removed the aligned memory allocation routines from some of the examples;
they're no longer needed.

No perf. difference on Core2/Core i5 CPUs; older CPUs may see some
regressions.

Still need to update the documentation for this change and finish reviewing
alignment issues in Load/Store instructions generated by .cpp files.
This commit is contained in:
Matt Pharr
2011-06-23 18:18:33 -07:00
parent d340dcbfcc
commit b84167dddd
11 changed files with 45 additions and 112 deletions
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8
stdlib-sse4.ll
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@@ -188,21 +188,21 @@ declare <4 x float> @llvm.x86.sse41.blendvps(<4 x float>, <4 x float>,
define void @__masked_store_blend_32(<4 x i32>* nocapture, <4 x i32>,
<4 x i32> %mask) nounwind alwaysinline {
%mask_as_float = bitcast <4 x i32> %mask to <4 x float>
%oldValue = load <4 x i32>* %0
%oldValue = load <4 x i32>* %0, align 4
%oldAsFloat = bitcast <4 x i32> %oldValue to <4 x float>
%newAsFloat = bitcast <4 x i32> %1 to <4 x float>
%blend = call <4 x float> @llvm.x86.sse41.blendvps(<4 x float> %oldAsFloat,
<4 x float> %newAsFloat,
<4 x float> %mask_as_float)
%blendAsInt = bitcast <4 x float> %blend to <4 x i32>
store <4 x i32> %blendAsInt, <4 x i32>* %0
store <4 x i32> %blendAsInt, <4 x i32>* %0, align 4
ret void
}
define void @__masked_store_blend_64(<4 x i64>* nocapture %ptr, <4 x i64> %new,
<4 x i32> %i32mask) nounwind alwaysinline {
%oldValue = load <4 x i64>* %ptr
%oldValue = load <4 x i64>* %ptr, align 8
%mask = bitcast <4 x i32> %i32mask to <4 x float>
; Do 4x64-bit blends by doing two <4 x i32> blends, where the <4 x i32> values
@@ -243,6 +243,6 @@ define void @__masked_store_blend_64(<4 x i64>* nocapture %ptr, <4 x i64> %new,
; reconstruct the final <4 x i64> vector
%final = shufflevector <2 x i64> %result01, <2 x i64> %result23,
<4 x i32> <i32 0, i32 1, i32 2, i32 3>
store <4 x i64> %final, <4 x i64> * %ptr
store <4 x i64> %final, <4 x i64> * %ptr, align 8
ret void
}