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llvm-mirror/test/CodeGen/X86/fast-isel-bitcasts-avx.ll
Andrea Di Biagio a1b187e1bf Reapply r249121 : "[FastISel][x86] Teach how to select SSE2/AVX bitcasts between 128/256-bit vector types." 
This patch teaches FastIsel the following two things:
1) On SSE2, no instructions are needed for bitcasts between 128-bit vector types;
2) On AVX, no instructions are needed for bitcasts between 256-bit vector types.

Example:

  %1 = bitcast <4 x i31> %V to <2 x i64>

Before (-fast-isel -fast-isel-abort=1):

  FastIsel miss: %1 = bitcast <4 x i31> %V to <2 x i64>

Now we don't fall back to SelectionDAG and we correctly fold that computation
propagating the register associated to %V.

Originally reviewed here: http://reviews.llvm.org/D13347

llvm-svn: 249147
2015-10-02 16:08:05 +00:00

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5.9 KiB
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; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=+avx -fast-isel -fast-isel-abort=1 -asm-verbose=0 | FileCheck %s
;
; Bitcasts between 256-bit vector types are no-ops since no instruction is
; needed for the conversion.
define <4 x i64> @v8i32_to_v4i64(<8 x i32> %a) {
;CHECK-LABEL: v8i32_to_v4i64:
;CHECK-NEXT: .cfi_startproc
;CHECK-NEXT: ret
%1 = bitcast <8 x i32> %a to <4 x i64>
ret <4 x i64> %1
}
define <4 x i64> @v16i16_to_v4i64(<16 x i16> %a) {
;CHECK-LABEL: v16i16_to_v4i64:
;CHECK-NEXT: .cfi_startproc
;CHECK-NEXT: ret
%1 = bitcast <16 x i16> %a to <4 x i64>
ret <4 x i64> %1
}
define <4 x i64> @v32i8_to_v4i64(<32 x i8> %a) {
;CHECK-LABEL: v32i8_to_v4i64:
;CHECK-NEXT: .cfi_startproc
;CHECK-NEXT: ret
%1 = bitcast <32 x i8> %a to <4 x i64>
ret <4 x i64> %1
}
define <4 x i64> @v4f64_to_v4i64(<4 x double> %a) {
;CHECK-LABEL: v4f64_to_v4i64:
;CHECK-NEXT: .cfi_startproc
;CHECK-NEXT: ret
%1 = bitcast <4 x double> %a to <4 x i64>
ret <4 x i64> %1
}
define <4 x i64> @v8f32_to_v4i64(<8 x float> %a) {
;CHECK-LABEL: v8f32_to_v4i64:
;CHECK-NEXT: .cfi_startproc
;CHECK-NEXT: ret
%1 = bitcast <8 x float> %a to <4 x i64>
ret <4 x i64> %1
}
define <8 x i32> @v4i64_to_v8i32(<4 x i64> %a) {
;CHECK-LABEL: v4i64_to_v8i32:
;CHECK-NEXT: .cfi_startproc
;CHECK-NEXT: ret
%1 = bitcast <4 x i64> %a to <8 x i32>
ret <8 x i32> %1
}
define <8 x i32> @v16i16_to_v8i32(<16 x i16> %a) {
;CHECK-LABEL: v16i16_to_v8i32:
;CHECK-NEXT: .cfi_startproc
;CHECK-NEXT: ret
%1 = bitcast <16 x i16> %a to <8 x i32>
ret <8 x i32> %1
}
define <8 x i32> @v32i8_to_v8i32(<32 x i8> %a) {
;CHECK-LABEL: v32i8_to_v8i32:
;CHECK-NEXT: .cfi_startproc
;CHECK-NEXT: ret
%1 = bitcast <32 x i8> %a to <8 x i32>
ret <8 x i32> %1
}
define <8 x i32> @v4f64_to_v8i32(<4 x double> %a) {
;CHECK-LABEL: v4f64_to_v8i32:
;CHECK-NEXT: .cfi_startproc
;CHECK-NEXT: ret
%1 = bitcast <4 x double> %a to <8 x i32>
ret <8 x i32> %1
}
define <8 x i32> @v8f32_to_v8i32(<8 x float> %a) {
;CHECK-LABEL: v8f32_to_v8i32:
;CHECK-NEXT: .cfi_startproc
;CHECK-NEXT: ret
%1 = bitcast <8 x float> %a to <8 x i32>
ret <8 x i32> %1
}
define <16 x i16> @v4i64_to_v16i16(<4 x i64> %a) {
;CHECK-LABEL: v4i64_to_v16i16:
;CHECK-NEXT: .cfi_startproc
;CHECK-NEXT: ret
%1 = bitcast <4 x i64> %a to <16 x i16>
ret <16 x i16> %1
}
define <16 x i16> @v8i32_to_v16i16(<8 x i32> %a) {
;CHECK-LABEL: v8i32_to_v16i16:
;CHECK-NEXT: .cfi_startproc
;CHECK-NEXT: ret
%1 = bitcast <8 x i32> %a to <16 x i16>
ret <16 x i16> %1
}
define <16 x i16> @v32i8_to_v16i16(<32 x i8> %a) {
;CHECK-LABEL: v32i8_to_v16i16:
;CHECK-NEXT: .cfi_startproc
;CHECK-NEXT: ret
%1 = bitcast <32 x i8> %a to <16 x i16>
ret <16 x i16> %1
}
define <16 x i16> @v4f64_to_v16i16(<4 x double> %a) {
;CHECK-LABEL: v4f64_to_v16i16:
;CHECK-NEXT: .cfi_startproc
;CHECK-NEXT: ret
%1 = bitcast <4 x double> %a to <16 x i16>
ret <16 x i16> %1
}
define <16 x i16> @v8f32_to_v16i16(<8 x float> %a) {
;CHECK-LABEL: v8f32_to_v16i16:
;CHECK-NEXT: .cfi_startproc
;CHECK-NEXT: ret
%1 = bitcast <8 x float> %a to <16 x i16>
ret <16 x i16> %1
}
define <32 x i8> @v16i16_to_v32i8(<16 x i16> %a) {
;CHECK-LABEL: v16i16_to_v32i8:
;CHECK-NEXT: .cfi_startproc
;CHECK-NEXT: ret
%1 = bitcast <16 x i16> %a to <32 x i8>
ret <32 x i8> %1
}
define <32 x i8> @v4i64_to_v32i8(<4 x i64> %a) {
;CHECK-LABEL: v4i64_to_v32i8:
;CHECK-NEXT: .cfi_startproc
;CHECK-NEXT: ret
%1 = bitcast <4 x i64> %a to <32 x i8>
ret <32 x i8> %1
}
define <32 x i8> @v8i32_to_v32i8(<8 x i32> %a) {
;CHECK-LABEL: v8i32_to_v32i8:
;CHECK-NEXT: .cfi_startproc
;CHECK-NEXT: ret
%1 = bitcast <8 x i32> %a to <32 x i8>
ret <32 x i8> %1
}
define <32 x i8> @v4f64_to_v32i8(<4 x double> %a) {
;CHECK-LABEL: v4f64_to_v32i8:
;CHECK-NEXT: .cfi_startproc
;CHECK-NEXT: ret
%1 = bitcast <4 x double> %a to <32 x i8>
ret <32 x i8> %1
}
define <32 x i8> @v8f32_to_v32i8(<8 x float> %a) {
;CHECK-LABEL: v8f32_to_v32i8:
;CHECK-NEXT: .cfi_startproc
;CHECK-NEXT: ret
%1 = bitcast <8 x float> %a to <32 x i8>
ret <32 x i8> %1
}
define <8 x float> @v32i8_to_v8f32(<32 x i8> %a) {
;CHECK-LABEL: v32i8_to_v8f32:
;CHECK-NEXT: .cfi_startproc
;CHECK-NEXT: ret
%1 = bitcast <32 x i8> %a to <8 x float>
ret <8 x float> %1
}
define <8 x float> @v16i16_to_v8f32(<16 x i16> %a) {
;CHECK-LABEL: v16i16_to_v8f32:
;CHECK-NEXT: .cfi_startproc
;CHECK-NEXT: ret
%1 = bitcast <16 x i16> %a to <8 x float>
ret <8 x float> %1
}
define <8 x float> @v4i64_to_v8f32(<4 x i64> %a) {
;CHECK-LABEL: v4i64_to_v8f32:
;CHECK-NEXT: .cfi_startproc
;CHECK-NEXT: ret
%1 = bitcast <4 x i64> %a to <8 x float>
ret <8 x float> %1
}
define <8 x float> @v8i32_to_v8f32(<8 x i32> %a) {
;CHECK-LABEL: v8i32_to_v8f32:
;CHECK-NEXT: .cfi_startproc
;CHECK-NEXT: ret
%1 = bitcast <8 x i32> %a to <8 x float>
ret <8 x float> %1
}
define <8 x float> @v4f64_to_v8f32(<4 x double> %a) {
;CHECK-LABEL: v4f64_to_v8f32:
;CHECK-NEXT: .cfi_startproc
;CHECK-NEXT: ret
%1 = bitcast <4 x double> %a to <8 x float>
ret <8 x float> %1
}
define <4 x double> @v8f32_to_v4f64(<8 x float> %a) {
;CHECK-LABEL: v8f32_to_v4f64:
;CHECK-NEXT: .cfi_startproc
;CHECK-NEXT: ret
%1 = bitcast <8 x float> %a to <4 x double>
ret <4 x double> %1
}
define <4 x double> @v32i8_to_v4f64(<32 x i8> %a) {
;CHECK-LABEL: v32i8_to_v4f64:
;CHECK-NEXT: .cfi_startproc
;CHECK-NEXT: ret
%1 = bitcast <32 x i8> %a to <4 x double>
ret <4 x double> %1
}
define <4 x double> @v16i16_to_v4f64(<16 x i16> %a) {
;CHECK-LABEL: v16i16_to_v4f64:
;CHECK-NEXT: .cfi_startproc
;CHECK-NEXT: ret
%1 = bitcast <16 x i16> %a to <4 x double>
ret <4 x double> %1
}
define <4 x double> @v4i64_to_v4f64(<4 x i64> %a) {
;CHECK-LABEL: v4i64_to_v4f64:
;CHECK-NEXT: .cfi_startproc
;CHECK-NEXT: ret
%1 = bitcast <4 x i64> %a to <4 x double>
ret <4 x double> %1
}
define <4 x double> @v8i32_to_v4f64(<8 x i32> %a) {
;CHECK-LABEL: v8i32_to_v4f64:
;CHECK-NEXT: .cfi_startproc
;CHECK-NEXT: ret
%1 = bitcast <8 x i32> %a to <4 x double>
ret <4 x double> %1
}
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