6599961c17
This patch contains following enhancements to SrcRegMap and DstRegMap:
1 In findOnlyInterestingUse not only check if the Reg is two address usage,
but also check after commutation can it be two address usage.
2 If a physical register is clobbered, remove SrcRegMap entries that are
mapped to it.
3 In processTiedPairs, when create a new COPY instruction, add a SrcRegMap
entry only when the COPY instruction is coalescable. (The COPY src is
killed)
With these enhancements isProfitableToCommute can do better commute decision,
and finally more register copies are removed.
Differential Revision: https://reviews.llvm.org/D108731
333 lines
12 KiB
LLVM
333 lines
12 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=i686-unknown-unknown | FileCheck %s --check-prefix=X86-NOBMI
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; RUN: llc < %s -mtriple=i686-unknown-unknown -mattr=+bmi2 | FileCheck %s --check-prefix=X86-BMI
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; RUN: llc < %s -mtriple=x86_64-unknown-unknown | FileCheck %s --check-prefix=X64-NOBMI
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; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=+bmi2 | FileCheck %s --check-prefix=X64-BMI
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; PR1198
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define i64 @foo(i64 %x, i64 %y) nounwind {
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; X86-NOBMI-LABEL: foo:
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; X86-NOBMI: # %bb.0:
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; X86-NOBMI-NEXT: pushl %ebp
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; X86-NOBMI-NEXT: pushl %ebx
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; X86-NOBMI-NEXT: pushl %edi
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; X86-NOBMI-NEXT: pushl %esi
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; X86-NOBMI-NEXT: movl {{[0-9]+}}(%esp), %edi
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; X86-NOBMI-NEXT: movl {{[0-9]+}}(%esp), %ebp
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; X86-NOBMI-NEXT: movl {{[0-9]+}}(%esp), %esi
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; X86-NOBMI-NEXT: movl {{[0-9]+}}(%esp), %ecx
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; X86-NOBMI-NEXT: movl %edi, %eax
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; X86-NOBMI-NEXT: mull %esi
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; X86-NOBMI-NEXT: movl %edx, %ebx
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; X86-NOBMI-NEXT: movl %ebp, %eax
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; X86-NOBMI-NEXT: mull %esi
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; X86-NOBMI-NEXT: movl %edx, %esi
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; X86-NOBMI-NEXT: movl %eax, %ebp
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; X86-NOBMI-NEXT: addl %ebx, %ebp
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; X86-NOBMI-NEXT: adcl $0, %esi
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; X86-NOBMI-NEXT: movl %edi, %eax
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; X86-NOBMI-NEXT: mull %ecx
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; X86-NOBMI-NEXT: addl %ebp, %eax
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; X86-NOBMI-NEXT: adcl %edx, %esi
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; X86-NOBMI-NEXT: setb %al
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; X86-NOBMI-NEXT: movzbl %al, %edi
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; X86-NOBMI-NEXT: movl {{[0-9]+}}(%esp), %eax
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; X86-NOBMI-NEXT: mull %ecx
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; X86-NOBMI-NEXT: addl %esi, %eax
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; X86-NOBMI-NEXT: adcl %edi, %edx
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; X86-NOBMI-NEXT: popl %esi
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; X86-NOBMI-NEXT: popl %edi
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; X86-NOBMI-NEXT: popl %ebx
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; X86-NOBMI-NEXT: popl %ebp
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; X86-NOBMI-NEXT: retl
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;
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; X86-BMI-LABEL: foo:
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; X86-BMI: # %bb.0:
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; X86-BMI-NEXT: pushl %ebp
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; X86-BMI-NEXT: pushl %ebx
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; X86-BMI-NEXT: pushl %edi
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; X86-BMI-NEXT: pushl %esi
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; X86-BMI-NEXT: movl {{[0-9]+}}(%esp), %ecx
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; X86-BMI-NEXT: movl {{[0-9]+}}(%esp), %eax
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; X86-BMI-NEXT: movl {{[0-9]+}}(%esp), %edi
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; X86-BMI-NEXT: movl {{[0-9]+}}(%esp), %esi
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; X86-BMI-NEXT: movl %ecx, %edx
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; X86-BMI-NEXT: mulxl %edi, %ebx, %ebx
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; X86-BMI-NEXT: movl %eax, %edx
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; X86-BMI-NEXT: mulxl %edi, %edi, %ebp
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; X86-BMI-NEXT: addl %ebx, %edi
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; X86-BMI-NEXT: adcl $0, %ebp
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; X86-BMI-NEXT: movl %ecx, %edx
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; X86-BMI-NEXT: mulxl %esi, %ecx, %ebx
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; X86-BMI-NEXT: addl %edi, %ecx
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; X86-BMI-NEXT: adcl %ebp, %ebx
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; X86-BMI-NEXT: setb %cl
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; X86-BMI-NEXT: movzbl %cl, %ecx
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; X86-BMI-NEXT: movl %eax, %edx
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; X86-BMI-NEXT: mulxl %esi, %eax, %edx
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; X86-BMI-NEXT: addl %ebx, %eax
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; X86-BMI-NEXT: adcl %ecx, %edx
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; X86-BMI-NEXT: popl %esi
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; X86-BMI-NEXT: popl %edi
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; X86-BMI-NEXT: popl %ebx
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; X86-BMI-NEXT: popl %ebp
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; X86-BMI-NEXT: retl
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;
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; X64-NOBMI-LABEL: foo:
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; X64-NOBMI: # %bb.0:
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; X64-NOBMI-NEXT: movq %rdi, %rax
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; X64-NOBMI-NEXT: mulq %rsi
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; X64-NOBMI-NEXT: movq %rdx, %rax
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; X64-NOBMI-NEXT: retq
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;
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; X64-BMI-LABEL: foo:
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; X64-BMI: # %bb.0:
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; X64-BMI-NEXT: movq %rdi, %rdx
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; X64-BMI-NEXT: mulxq %rsi, %rax, %rax
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; X64-BMI-NEXT: retq
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%tmp0 = zext i64 %x to i128
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%tmp1 = zext i64 %y to i128
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%tmp2 = mul i128 %tmp0, %tmp1
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%tmp7 = zext i32 64 to i128
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%tmp3 = lshr i128 %tmp2, %tmp7
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%tmp4 = trunc i128 %tmp3 to i64
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ret i64 %tmp4
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}
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; <rdar://problem/14096009> superfluous multiply by high part of
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; zero-extended value.
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define i64 @mul1(i64 %n, i64* nocapture %z, i64* nocapture %x, i64 %y) nounwind {
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; X86-NOBMI-LABEL: mul1:
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; X86-NOBMI: # %bb.0: # %entry
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; X86-NOBMI-NEXT: pushl %ebp
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; X86-NOBMI-NEXT: pushl %ebx
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; X86-NOBMI-NEXT: pushl %edi
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; X86-NOBMI-NEXT: pushl %esi
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; X86-NOBMI-NEXT: subl $24, %esp
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; X86-NOBMI-NEXT: movl {{[0-9]+}}(%esp), %ecx
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; X86-NOBMI-NEXT: movl {{[0-9]+}}(%esp), %eax
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; X86-NOBMI-NEXT: orl %ecx, %eax
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; X86-NOBMI-NEXT: je .LBB1_3
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; X86-NOBMI-NEXT: # %bb.1: # %for.body.preheader
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; X86-NOBMI-NEXT: xorl %eax, %eax
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; X86-NOBMI-NEXT: xorl %edx, %edx
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; X86-NOBMI-NEXT: xorl %ecx, %ecx
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; X86-NOBMI-NEXT: movl $0, (%esp) # 4-byte Folded Spill
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; X86-NOBMI-NEXT: .p2align 4, 0x90
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; X86-NOBMI-NEXT: .LBB1_2: # %for.body
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; X86-NOBMI-NEXT: # =>This Inner Loop Header: Depth=1
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; X86-NOBMI-NEXT: movl %edx, {{[-0-9]+}}(%e{{[sb]}}p) # 4-byte Spill
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; X86-NOBMI-NEXT: movl %eax, {{[-0-9]+}}(%e{{[sb]}}p) # 4-byte Spill
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; X86-NOBMI-NEXT: movl {{[0-9]+}}(%esp), %eax
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; X86-NOBMI-NEXT: movl (%eax,%ecx,8), %esi
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; X86-NOBMI-NEXT: movl 4(%eax,%ecx,8), %ebx
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; X86-NOBMI-NEXT: movl %ebx, {{[-0-9]+}}(%e{{[sb]}}p) # 4-byte Spill
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; X86-NOBMI-NEXT: movl %esi, %eax
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; X86-NOBMI-NEXT: movl {{[0-9]+}}(%esp), %edi
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; X86-NOBMI-NEXT: mull %edi
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; X86-NOBMI-NEXT: movl %edx, {{[-0-9]+}}(%e{{[sb]}}p) # 4-byte Spill
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; X86-NOBMI-NEXT: movl %eax, {{[-0-9]+}}(%e{{[sb]}}p) # 4-byte Spill
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; X86-NOBMI-NEXT: movl %ebx, %eax
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; X86-NOBMI-NEXT: mull %edi
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; X86-NOBMI-NEXT: movl %edx, %ebp
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; X86-NOBMI-NEXT: movl %eax, %ebx
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; X86-NOBMI-NEXT: addl {{[-0-9]+}}(%e{{[sb]}}p), %ebx # 4-byte Folded Reload
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; X86-NOBMI-NEXT: adcl $0, %ebp
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; X86-NOBMI-NEXT: movl %esi, %eax
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; X86-NOBMI-NEXT: movl {{[0-9]+}}(%esp), %edx
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; X86-NOBMI-NEXT: mull %edx
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; X86-NOBMI-NEXT: movl %edx, %edi
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; X86-NOBMI-NEXT: movl %eax, %esi
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; X86-NOBMI-NEXT: addl %ebx, %esi
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; X86-NOBMI-NEXT: adcl %ebp, %edi
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; X86-NOBMI-NEXT: setb %bl
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; X86-NOBMI-NEXT: movl {{[-0-9]+}}(%e{{[sb]}}p), %eax # 4-byte Reload
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; X86-NOBMI-NEXT: mull {{[0-9]+}}(%esp)
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; X86-NOBMI-NEXT: addl %edi, %eax
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; X86-NOBMI-NEXT: movzbl %bl, %edi
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; X86-NOBMI-NEXT: movl {{[0-9]+}}(%esp), %ebp
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; X86-NOBMI-NEXT: adcl %edi, %edx
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; X86-NOBMI-NEXT: movl %ecx, %ebx
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; X86-NOBMI-NEXT: movl {{[-0-9]+}}(%e{{[sb]}}p), %ecx # 4-byte Reload
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; X86-NOBMI-NEXT: addl {{[-0-9]+}}(%e{{[sb]}}p), %ecx # 4-byte Folded Reload
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; X86-NOBMI-NEXT: adcl {{[-0-9]+}}(%e{{[sb]}}p), %esi # 4-byte Folded Reload
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; X86-NOBMI-NEXT: adcl $0, %eax
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; X86-NOBMI-NEXT: adcl $0, %edx
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; X86-NOBMI-NEXT: movl {{[0-9]+}}(%esp), %edi
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; X86-NOBMI-NEXT: movl %ecx, (%edi,%ebx,8)
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; X86-NOBMI-NEXT: movl %ebx, %ecx
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; X86-NOBMI-NEXT: movl %esi, 4(%edi,%ebx,8)
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; X86-NOBMI-NEXT: addl $1, %ecx
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; X86-NOBMI-NEXT: movl (%esp), %edi # 4-byte Reload
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; X86-NOBMI-NEXT: adcl $0, %edi
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; X86-NOBMI-NEXT: movl %ecx, %esi
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; X86-NOBMI-NEXT: xorl {{[0-9]+}}(%esp), %esi
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; X86-NOBMI-NEXT: movl %edi, (%esp) # 4-byte Spill
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; X86-NOBMI-NEXT: xorl %ebp, %edi
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; X86-NOBMI-NEXT: orl %esi, %edi
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; X86-NOBMI-NEXT: jne .LBB1_2
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; X86-NOBMI-NEXT: .LBB1_3: # %for.end
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; X86-NOBMI-NEXT: xorl %eax, %eax
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; X86-NOBMI-NEXT: xorl %edx, %edx
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; X86-NOBMI-NEXT: addl $24, %esp
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; X86-NOBMI-NEXT: popl %esi
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; X86-NOBMI-NEXT: popl %edi
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; X86-NOBMI-NEXT: popl %ebx
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; X86-NOBMI-NEXT: popl %ebp
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; X86-NOBMI-NEXT: retl
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;
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; X86-BMI-LABEL: mul1:
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; X86-BMI: # %bb.0: # %entry
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; X86-BMI-NEXT: pushl %ebp
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; X86-BMI-NEXT: pushl %ebx
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; X86-BMI-NEXT: pushl %edi
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; X86-BMI-NEXT: pushl %esi
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; X86-BMI-NEXT: subl $20, %esp
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; X86-BMI-NEXT: movl {{[0-9]+}}(%esp), %ecx
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; X86-BMI-NEXT: movl {{[0-9]+}}(%esp), %eax
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; X86-BMI-NEXT: orl %ecx, %eax
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; X86-BMI-NEXT: je .LBB1_3
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; X86-BMI-NEXT: # %bb.1: # %for.body.preheader
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; X86-BMI-NEXT: xorl %ecx, %ecx
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; X86-BMI-NEXT: xorl %eax, %eax
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; X86-BMI-NEXT: xorl %ebx, %ebx
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; X86-BMI-NEXT: xorl %ebp, %ebp
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; X86-BMI-NEXT: .p2align 4, 0x90
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; X86-BMI-NEXT: .LBB1_2: # %for.body
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; X86-BMI-NEXT: # =>This Inner Loop Header: Depth=1
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; X86-BMI-NEXT: movl %ecx, {{[-0-9]+}}(%e{{[sb]}}p) # 4-byte Spill
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; X86-BMI-NEXT: movl %eax, (%esp) # 4-byte Spill
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; X86-BMI-NEXT: movl %ebp, {{[-0-9]+}}(%e{{[sb]}}p) # 4-byte Spill
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; X86-BMI-NEXT: movl {{[0-9]+}}(%esp), %eax
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; X86-BMI-NEXT: movl (%eax,%ebx,8), %ecx
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; X86-BMI-NEXT: movl 4(%eax,%ebx,8), %esi
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; X86-BMI-NEXT: movl %esi, {{[-0-9]+}}(%e{{[sb]}}p) # 4-byte Spill
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; X86-BMI-NEXT: movl %ecx, %edx
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; X86-BMI-NEXT: movl {{[0-9]+}}(%esp), %eax
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; X86-BMI-NEXT: mulxl %eax, %edx, %edi
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; X86-BMI-NEXT: movl %edx, {{[-0-9]+}}(%e{{[sb]}}p) # 4-byte Spill
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; X86-BMI-NEXT: movl %esi, %edx
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; X86-BMI-NEXT: mulxl %eax, %eax, %esi
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; X86-BMI-NEXT: addl %edi, %eax
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; X86-BMI-NEXT: adcl $0, %esi
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; X86-BMI-NEXT: movl %ecx, %edx
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; X86-BMI-NEXT: movl {{[0-9]+}}(%esp), %ecx
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; X86-BMI-NEXT: mulxl %ecx, %edi, %ebp
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; X86-BMI-NEXT: addl %eax, %edi
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; X86-BMI-NEXT: adcl %esi, %ebp
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; X86-BMI-NEXT: movl {{[-0-9]+}}(%e{{[sb]}}p), %edx # 4-byte Reload
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; X86-BMI-NEXT: mulxl %ecx, %ecx, %eax
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; X86-BMI-NEXT: setb %dl
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; X86-BMI-NEXT: addl %ebp, %ecx
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; X86-BMI-NEXT: movl {{[-0-9]+}}(%e{{[sb]}}p), %ebp # 4-byte Reload
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; X86-BMI-NEXT: movl {{[0-9]+}}(%esp), %esi
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; X86-BMI-NEXT: movzbl %dl, %edx
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; X86-BMI-NEXT: adcl %edx, %eax
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; X86-BMI-NEXT: movl %eax, %edx
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; X86-BMI-NEXT: movl {{[-0-9]+}}(%e{{[sb]}}p), %eax # 4-byte Reload
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; X86-BMI-NEXT: addl {{[-0-9]+}}(%e{{[sb]}}p), %eax # 4-byte Folded Reload
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; X86-BMI-NEXT: adcl (%esp), %edi # 4-byte Folded Reload
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; X86-BMI-NEXT: adcl $0, %ecx
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; X86-BMI-NEXT: adcl $0, %edx
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; X86-BMI-NEXT: movl %edx, (%esp) # 4-byte Spill
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; X86-BMI-NEXT: movl {{[0-9]+}}(%esp), %edx
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; X86-BMI-NEXT: movl %eax, (%edx,%ebx,8)
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; X86-BMI-NEXT: movl %edi, 4(%edx,%ebx,8)
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; X86-BMI-NEXT: movl {{[0-9]+}}(%esp), %edi
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; X86-BMI-NEXT: addl $1, %ebx
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; X86-BMI-NEXT: adcl $0, %ebp
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; X86-BMI-NEXT: movl %ebx, %edx
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; X86-BMI-NEXT: xorl %esi, %edx
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; X86-BMI-NEXT: movl %ebp, %esi
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; X86-BMI-NEXT: xorl %edi, %esi
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; X86-BMI-NEXT: orl %edx, %esi
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; X86-BMI-NEXT: movl (%esp), %eax # 4-byte Reload
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; X86-BMI-NEXT: jne .LBB1_2
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; X86-BMI-NEXT: .LBB1_3: # %for.end
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; X86-BMI-NEXT: xorl %eax, %eax
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; X86-BMI-NEXT: xorl %edx, %edx
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; X86-BMI-NEXT: addl $20, %esp
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; X86-BMI-NEXT: popl %esi
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; X86-BMI-NEXT: popl %edi
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; X86-BMI-NEXT: popl %ebx
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; X86-BMI-NEXT: popl %ebp
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; X86-BMI-NEXT: retl
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;
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; X64-NOBMI-LABEL: mul1:
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; X64-NOBMI: # %bb.0: # %entry
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; X64-NOBMI-NEXT: testq %rdi, %rdi
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; X64-NOBMI-NEXT: je .LBB1_3
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; X64-NOBMI-NEXT: # %bb.1: # %for.body.preheader
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; X64-NOBMI-NEXT: movq %rcx, %r8
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; X64-NOBMI-NEXT: movq %rdx, %r9
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; X64-NOBMI-NEXT: xorl %r10d, %r10d
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; X64-NOBMI-NEXT: xorl %ecx, %ecx
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; X64-NOBMI-NEXT: .p2align 4, 0x90
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; X64-NOBMI-NEXT: .LBB1_2: # %for.body
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; X64-NOBMI-NEXT: # =>This Inner Loop Header: Depth=1
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; X64-NOBMI-NEXT: movq %r8, %rax
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; X64-NOBMI-NEXT: mulq (%r9,%rcx,8)
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; X64-NOBMI-NEXT: addq %r10, %rax
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; X64-NOBMI-NEXT: adcq $0, %rdx
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; X64-NOBMI-NEXT: movq %rax, (%rsi,%rcx,8)
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; X64-NOBMI-NEXT: incq %rcx
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; X64-NOBMI-NEXT: cmpq %rcx, %rdi
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; X64-NOBMI-NEXT: movq %rdx, %r10
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; X64-NOBMI-NEXT: jne .LBB1_2
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; X64-NOBMI-NEXT: .LBB1_3: # %for.end
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; X64-NOBMI-NEXT: xorl %eax, %eax
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; X64-NOBMI-NEXT: retq
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;
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; X64-BMI-LABEL: mul1:
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; X64-BMI: # %bb.0: # %entry
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; X64-BMI-NEXT: testq %rdi, %rdi
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; X64-BMI-NEXT: je .LBB1_3
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; X64-BMI-NEXT: # %bb.1: # %for.body.preheader
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; X64-BMI-NEXT: movq %rcx, %r8
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; X64-BMI-NEXT: movq %rdx, %r9
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; X64-BMI-NEXT: xorl %r10d, %r10d
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; X64-BMI-NEXT: xorl %ecx, %ecx
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; X64-BMI-NEXT: .p2align 4, 0x90
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; X64-BMI-NEXT: .LBB1_2: # %for.body
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; X64-BMI-NEXT: # =>This Inner Loop Header: Depth=1
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; X64-BMI-NEXT: movq %r8, %rdx
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; X64-BMI-NEXT: mulxq (%r9,%rcx,8), %rax, %rdx
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; X64-BMI-NEXT: addq %r10, %rax
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; X64-BMI-NEXT: adcq $0, %rdx
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; X64-BMI-NEXT: movq %rax, (%rsi,%rcx,8)
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; X64-BMI-NEXT: incq %rcx
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; X64-BMI-NEXT: cmpq %rcx, %rdi
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; X64-BMI-NEXT: movq %rdx, %r10
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; X64-BMI-NEXT: jne .LBB1_2
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; X64-BMI-NEXT: .LBB1_3: # %for.end
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; X64-BMI-NEXT: xorl %eax, %eax
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; X64-BMI-NEXT: retq
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entry:
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%conv = zext i64 %y to i128
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%cmp11 = icmp eq i64 %n, 0
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br i1 %cmp11, label %for.end, label %for.body
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for.body: ; preds = %entry, %for.body
|
|
%carry.013 = phi i64 [ %conv6, %for.body ], [ 0, %entry ]
|
|
%i.012 = phi i64 [ %inc, %for.body ], [ 0, %entry ]
|
|
%arrayidx = getelementptr inbounds i64, i64* %x, i64 %i.012
|
|
%0 = load i64, i64* %arrayidx, align 8
|
|
%conv2 = zext i64 %0 to i128
|
|
%mul = mul i128 %conv2, %conv
|
|
%conv3 = zext i64 %carry.013 to i128
|
|
%add = add i128 %mul, %conv3
|
|
%conv4 = trunc i128 %add to i64
|
|
%arrayidx5 = getelementptr inbounds i64, i64* %z, i64 %i.012
|
|
store i64 %conv4, i64* %arrayidx5, align 8
|
|
%shr = lshr i128 %add, 64
|
|
%conv6 = trunc i128 %shr to i64
|
|
%inc = add i64 %i.012, 1
|
|
%exitcond = icmp eq i64 %inc, %n
|
|
br i1 %exitcond, label %for.end, label %for.body
|
|
|
|
for.end: ; preds = %for.body, %entry
|
|
ret i64 0
|
|
}
|