2015-01-28 22:08:22 +08:00
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; RUN: llc < %s -mtriple=x86_64-pc-linux-gnu | FileCheck %s --check-prefix=X64
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; RUN: llc < %s -mtriple=x86_64-pc-linux-gnux32 | FileCheck %s --check-prefix=X64
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; RUN: llc < %s -mtriple=i686-pc-linux | FileCheck %s --check-prefix=X86
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define i32 @mul4_32(i32 %A) {
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; X64-LABEL: mul4_32:
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; X64: leal
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; X86-LABEL: mul4_32:
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; X86: shll
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%mul = mul i32 %A, 4
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ret i32 %mul
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}
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define i64 @mul4_64(i64 %A) {
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; X64-LABEL: mul4_64:
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; X64: leaq
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; X86-LABEL: mul4_64:
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; X86: shldl
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; X86: shll
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%mul = mul i64 %A, 4
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ret i64 %mul
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}
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define i32 @mul4096_32(i32 %A) {
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; X64-LABEL: mul4096_32:
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; X64: shll
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; X86-LABEL: mul4096_32:
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; X86: shll
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%mul = mul i32 %A, 4096
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ret i32 %mul
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}
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define i64 @mul4096_64(i64 %A) {
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; X64-LABEL: mul4096_64:
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; X64: shlq
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; X86-LABEL: mul4096_64:
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; X86: shldl
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; X86: shll
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%mul = mul i64 %A, 4096
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ret i64 %mul
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}
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define i32 @mulmin4096_32(i32 %A) {
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; X64-LABEL: mulmin4096_32:
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; X64: shll
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; X64-NEXT: negl
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; X86-LABEL: mulmin4096_32:
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; X86: shll
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; X86-NEXT: negl
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%mul = mul i32 %A, -4096
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ret i32 %mul
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}
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define i64 @mulmin4096_64(i64 %A) {
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; X64-LABEL: mulmin4096_64:
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; X64: shlq
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; X64-NEXT: negq
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; X86-LABEL: mulmin4096_64:
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; X86: shldl
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; X86-NEXT: shll
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; X86-NEXT: xorl
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; X86-NEXT: negl
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; X86-NEXT: sbbl
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%mul = mul i64 %A, -4096
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ret i64 %mul
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}
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define i32 @mul3_32(i32 %A) {
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; X64-LABEL: mul3_32:
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; X64: leal
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; X86-LABEL: mul3_32:
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; But why?!
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; X86: imull
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%mul = mul i32 %A, 3
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ret i32 %mul
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}
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define i64 @mul3_64(i64 %A) {
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; X64-LABEL: mul3_64:
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; X64: leaq
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; X86-LABEL: mul3_64:
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; X86: mull
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; X86-NEXT: imull
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%mul = mul i64 %A, 3
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ret i64 %mul
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}
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define i32 @mul40_32(i32 %A) {
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; X64-LABEL: mul40_32:
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; X64: shll
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; X64-NEXT: leal
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; X86-LABEL: mul40_32:
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; X86: shll
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; X86-NEXT: leal
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%mul = mul i32 %A, 40
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ret i32 %mul
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}
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define i64 @mul40_64(i64 %A) {
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; X64-LABEL: mul40_64:
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; X64: shlq
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; X64-NEXT: leaq
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; X86-LABEL: mul40_64:
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; X86: leal
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; X86-NEXT: movl
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; X86-NEXT: mull
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; X86-NEXT: leal
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%mul = mul i64 %A, 40
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ret i64 %mul
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}
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2015-08-12 19:27:26 +08:00
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define i32 @mul4_32_minsize(i32 %A) minsize {
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; X64-LABEL: mul4_32_minsize:
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; X64: leal
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; X86-LABEL: mul4_32_minsize:
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; X86: shll
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%mul = mul i32 %A, 4
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ret i32 %mul
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}
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define i32 @mul40_32_minsize(i32 %A) minsize {
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; X64-LABEL: mul40_32_minsize:
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; X64: imull
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; X86-LABEL: mul40_32_minsize:
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; X86: imull
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%mul = mul i32 %A, 40
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ret i32 %mul
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}
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[X86ISelLowering] Add additional support for multiplication-to-shift conversion.
Summary: This patch adds support of conversion (mul x, 2^N + 1) => (add (shl x, N), x) and (mul x, 2^N - 1) => (sub (shl x, N), x) if the multiplication can not be converted to LEA + SHL or LEA + LEA. LLVM has already supported this on ARM, and it should also be useful on X86. Note the patch currently only applies to cases where the constant operand is positive, and I am planing to add another patch to support negative cases after this.
Reviewers: craig.topper, RKSimon
Subscribers: aemerson, llvm-commits
Differential Revision: http://reviews.llvm.org/D14603
llvm-svn: 255415
2015-12-12 09:04:15 +08:00
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define i32 @mul33_32(i32 %A) {
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; X64-LABEL: mul33_32:
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; X64: shll
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; X64-NEXT: leal
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; X86-LABEL: mul33_32:
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; X86: shll
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; X86-NEXT: addl
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%mul = mul i32 %A, 33
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ret i32 %mul
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}
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define i32 @mul31_32(i32 %A) {
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; X64-LABEL: mul31_32:
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; X64: shll
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; X64-NEXT: subl
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; X86-LABEL: mul31_32:
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; X86: shll
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; X86-NEXT: subl
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%mul = mul i32 %A, 31
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ret i32 %mul
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}
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define i32 @mul0_32(i32 %A) {
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; X64-LABEL: mul0_32:
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; X64: xorl %eax, %eax
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%mul = mul i32 %A, 0
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ret i32 %mul
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}
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define i32 @mul4294967295_32(i32 %A) {
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; X64-LABEL: mul4294967295_32:
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; X64: negl %edi
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; X64-NEXT: movl %edi, %eax
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%mul = mul i32 %A, 4294967295
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ret i32 %mul
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}
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define i64 @mul18446744073709551615_64(i64 %A) {
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; X64-LABEL: mul18446744073709551615_64:
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; X64: negq %rdi
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; X64-NEXT: movq %rdi, %rax
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%mul = mul i64 %A, 18446744073709551615
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ret i64 %mul
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}
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