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edf30ecc75
Turn expensive 64 bit shift into 32 bit if shift does not overflow int: shl (ext x) => zext (shl x) Differential Revision: https://reviews.llvm.org/D33367 llvm-svn: 303569
46 lines
1.3 KiB
LLVM
46 lines
1.3 KiB
LLVM
; RUN: llc -march=amdgcn < %s | FileCheck %s
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; CHECK-LABEL: {{^}}zext_shl64_to_32:
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; CHECK: s_lshl_b32
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; CHECK-NOT: s_lshl_b64
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define amdgpu_kernel void @zext_shl64_to_32(i64 addrspace(1)* nocapture %out, i32 %x) {
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%and = and i32 %x, 1073741823
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%ext = zext i32 %and to i64
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%shl = shl i64 %ext, 2
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store i64 %shl, i64 addrspace(1)* %out, align 4
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ret void
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}
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; CHECK-LABEL: {{^}}sext_shl64_to_32:
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; CHECK: s_lshl_b32
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; CHECK-NOT: s_lshl_b64
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define amdgpu_kernel void @sext_shl64_to_32(i64 addrspace(1)* nocapture %out, i32 %x) {
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%and = and i32 %x, 536870911
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%ext = sext i32 %and to i64
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%shl = shl i64 %ext, 2
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store i64 %shl, i64 addrspace(1)* %out, align 4
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ret void
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}
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; CHECK-LABEL: {{^}}zext_shl64_overflow:
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; CHECK: s_lshl_b64
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; CHECK-NOT: s_lshl_b32
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define amdgpu_kernel void @zext_shl64_overflow(i64 addrspace(1)* nocapture %out, i32 %x) {
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%and = and i32 %x, 2147483647
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%ext = zext i32 %and to i64
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%shl = shl i64 %ext, 2
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store i64 %shl, i64 addrspace(1)* %out, align 4
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ret void
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}
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; CHECK-LABEL: {{^}}sext_shl64_overflow:
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; CHECK: s_lshl_b64
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; CHECK-NOT: s_lshl_b32
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define amdgpu_kernel void @sext_shl64_overflow(i64 addrspace(1)* nocapture %out, i32 %x) {
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%and = and i32 %x, 2147483647
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%ext = sext i32 %and to i64
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%shl = shl i64 %ext, 2
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store i64 %shl, i64 addrspace(1)* %out, align 4
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ret void
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}
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