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[FastISel][AArch64] Simplify mul to shift when possible.

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This is related to rdar://problem/18369687.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217980 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Juergen Ributzka
2014-09-17 20:35:41 +00:00
parent dc4eb3d6dc
commit 580875d39d
2 changed files with 80 additions and 40 deletions
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60
test/CodeGen/AArch64/fast-isel-mul.ll
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@@ -1,40 +1,44 @@
; RUN: llc -fast-isel -fast-isel-abort -verify-machineinstrs -mtriple=aarch64 < %s | FileCheck %s
; RUN: llc -fast-isel -fast-isel-abort -verify-machineinstrs -mtriple=aarch64-apple-darwin < %s | FileCheck %s
@var8 = global i8 0
@var16 = global i16 0
@var32 = global i32 0
@var64 = global i64 0
define void @test_mul8(i8 %lhs, i8 %rhs) {
define zeroext i8 @test_mul8(i8 %lhs, i8 %rhs) {
; CHECK-LABEL: test_mul8:
; CHECK: mul {{w[0-9]+}}, w0, w1
; %lhs = load i8* @var8
; %rhs = load i8* @var8
%prod = mul i8 %lhs, %rhs
store i8 %prod, i8* @var8
ret void
; CHECK: mul {{w[0-9]+}}, w0, w1
%1 = mul i8 %lhs, %rhs
ret i8 %1
}
define void @test_mul16(i16 %lhs, i16 %rhs) {
define zeroext i16 @test_mul16(i16 %lhs, i16 %rhs) {
; CHECK-LABEL: test_mul16:
; CHECK: mul {{w[0-9]+}}, w0, w1
%prod = mul i16 %lhs, %rhs
store i16 %prod, i16* @var16
ret void
; CHECK: mul {{w[0-9]+}}, w0, w1
%1 = mul i16 %lhs, %rhs
ret i16 %1
}
define void @test_mul32(i32 %lhs, i32 %rhs) {
define i32 @test_mul32(i32 %lhs, i32 %rhs) {
; CHECK-LABEL: test_mul32:
; CHECK: mul {{w[0-9]+}}, w0, w1
%prod = mul i32 %lhs, %rhs
store i32 %prod, i32* @var32
ret void
; CHECK: mul {{w[0-9]+}}, w0, w1
%1 = mul i32 %lhs, %rhs
ret i32 %1
}
define void @test_mul64(i64 %lhs, i64 %rhs) {
define i64 @test_mul64(i64 %lhs, i64 %rhs) {
; CHECK-LABEL: test_mul64:
; CHECK: mul {{x[0-9]+}}, x0, x1
%prod = mul i64 %lhs, %rhs
store i64 %prod, i64* @var64
ret void
; CHECK: mul {{x[0-9]+}}, x0, x1
%1 = mul i64 %lhs, %rhs
ret i64 %1
}
define i32 @test_mul2shift_i32(i32 %a) {
; CHECK-LABEL: test_mul2shift_i32:
; CHECK: lsl {{w[0-9]+}}, w0, #2
%1 = mul i32 %a, 4
ret i32 %1
}
define i64 @test_mul2shift_i64(i64 %a) {
; CHECK-LABEL: test_mul2shift_i64:
; CHECK: lsl {{x[0-9]+}}, x0, #3
%1 = mul i64 %a, 8
ret i64 %1
}