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ceecde00d5
This change is discussed in D15392 and should allow us to effectively revert: http://llvm.org/viewvc/llvm-project?view=revision&revision=255261 if we canonicalize bitcasts ahead of extracts. It should be safe to convert any pair of bitcasts into a single bitcast, however, it was mentioned here: http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20110829/127089.html that we're not allowed to bitcast from an x86_mmx to some other types, but I'm not seeing any failures from that, and we have regression tests in CodeGen/X86 that appear to cover all of those cases. Some day we'll get to remove that MMX wart from LLVM IR completely? Differential Revision: http://reviews.llvm.org/D15468 llvm-svn: 255399
85 lines
2.3 KiB
LLVM
85 lines
2.3 KiB
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
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; Check all scalar / vector combinations for a pair of bitcasts.
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define ppc_fp128 @bitcast_bitcast_s_s_s(i128 %a) {
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%bc1 = bitcast i128 %a to fp128
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%bc2 = bitcast fp128 %bc1 to ppc_fp128
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ret ppc_fp128 %bc2
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; CHECK-LABEL: @bitcast_bitcast_s_s_s(
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; CHECK-NEXT: %bc2 = bitcast i128 %a to ppc_fp128
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; CHECK-NEXT: ret ppc_fp128 %bc2
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}
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define <2 x i32> @bitcast_bitcast_s_s_v(i64 %a) {
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%bc1 = bitcast i64 %a to double
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%bc2 = bitcast double %bc1 to <2 x i32>
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ret <2 x i32> %bc2
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; CHECK-LABEL: @bitcast_bitcast_s_s_v(
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; CHECK-NEXT: %bc2 = bitcast i64 %a to <2 x i32>
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; CHECK-NEXT: ret <2 x i32> %bc2
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}
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define double @bitcast_bitcast_s_v_s(i64 %a) {
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%bc1 = bitcast i64 %a to <2 x i32>
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%bc2 = bitcast <2 x i32> %bc1 to double
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ret double %bc2
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; CHECK-LABEL: @bitcast_bitcast_s_v_s(
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; CHECK-NEXT: %bc2 = bitcast i64 %a to double
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; CHECK-NEXT: ret double %bc2
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}
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define <2 x i32> @bitcast_bitcast_s_v_v(i64 %a) {
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%bc1 = bitcast i64 %a to <4 x i16>
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%bc2 = bitcast <4 x i16> %bc1 to <2 x i32>
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ret <2 x i32> %bc2
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; CHECK-LABEL: @bitcast_bitcast_s_v_v(
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; CHECK-NEXT: %bc2 = bitcast i64 %a to <2 x i32>
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; CHECK-NEXT: ret <2 x i32> %bc2
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}
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define i64 @bitcast_bitcast_v_s_s(<2 x i32> %a) {
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%bc1 = bitcast <2 x i32> %a to double
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%bc2 = bitcast double %bc1 to i64
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ret i64 %bc2
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; CHECK-LABEL: @bitcast_bitcast_v_s_s(
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; CHECK-NEXT: %bc2 = bitcast <2 x i32> %a to i64
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; CHECK-NEXT: ret i64 %bc2
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}
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define <4 x i16> @bitcast_bitcast_v_s_v(<2 x i32> %a) {
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%bc1 = bitcast <2 x i32> %a to double
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%bc2 = bitcast double %bc1 to <4 x i16>
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ret <4 x i16> %bc2
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; CHECK-LABEL: @bitcast_bitcast_v_s_v(
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; CHECK-NEXT: %bc2 = bitcast <2 x i32> %a to <4 x i16>
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; CHECK-NEXT: ret <4 x i16> %bc2
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}
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define double @bitcast_bitcast_v_v_s(<2 x float> %a) {
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%bc1 = bitcast <2 x float> %a to <4 x i16>
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%bc2 = bitcast <4 x i16> %bc1 to double
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ret double %bc2
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; CHECK-LABEL: @bitcast_bitcast_v_v_s(
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; CHECK-NEXT: %bc2 = bitcast <2 x float> %a to double
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; CHECK-NEXT: ret double %bc2
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}
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define <2 x i32> @bitcast_bitcast_v_v_v(<2 x float> %a) {
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%bc1 = bitcast <2 x float> %a to <4 x i16>
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%bc2 = bitcast <4 x i16> %bc1 to <2 x i32>
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ret <2 x i32> %bc2
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; CHECK-LABEL: @bitcast_bitcast_v_v_v(
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; CHECK-NEXT: %bc2 = bitcast <2 x float> %a to <2 x i32>
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; CHECK-NEXT: ret <2 x i32> %bc2
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}
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