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llvm-mirror/test/CodeGen/X86/i128-mul.ll
Craig Topper bcfbda1501 [X86] Add pseudo instructions to use MULX with a single destination when the low result isn't used. 
The instruction is defined to only produce high result if both
destinations are the same. We can exploit this to avoid
unnecessarily clobbering a register.

In order to hide this from register allocation we use a pseudo
instruction and expand the result during MCInst creation.

Differential Revision: https://reviews.llvm.org/D80500
2020-05-30 16:01:01 -07:00

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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -mtriple=i686-unknown-unknown | FileCheck %s --check-prefixes=X86,X86-NOBMI
; RUN: llc < %s -mtriple=i686-unknown-unknown -mattr=+bmi2 | FileCheck %s --check-prefixes=X86,X86-BMI
; RUN: llc < %s -mtriple=x86_64-unknown-unknown | FileCheck %s --check-prefixes=X64,X64-NOBMI
; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=+bmi2 | FileCheck %s --check-prefixes=X64,X64-BMI
; PR1198
define i64 @foo(i64 %x, i64 %y) nounwind {
; X86-NOBMI-LABEL: foo:
; X86-NOBMI: # %bb.0:
; X86-NOBMI-NEXT: pushl %ebp
; X86-NOBMI-NEXT: pushl %ebx
; X86-NOBMI-NEXT: pushl %edi
; X86-NOBMI-NEXT: pushl %esi
; X86-NOBMI-NEXT: movl {{[0-9]+}}(%esp), %ecx
; X86-NOBMI-NEXT: movl {{[0-9]+}}(%esp), %ebp
; X86-NOBMI-NEXT: movl {{[0-9]+}}(%esp), %ebx
; X86-NOBMI-NEXT: movl {{[0-9]+}}(%esp), %esi
; X86-NOBMI-NEXT: movl %ecx, %eax
; X86-NOBMI-NEXT: mull %ebx
; X86-NOBMI-NEXT: movl %edx, %edi
; X86-NOBMI-NEXT: movl %ebp, %eax
; X86-NOBMI-NEXT: mull %ebx
; X86-NOBMI-NEXT: movl %edx, %ebx
; X86-NOBMI-NEXT: movl %eax, %ebp
; X86-NOBMI-NEXT: addl %edi, %ebp
; X86-NOBMI-NEXT: adcl $0, %ebx
; X86-NOBMI-NEXT: movl %ecx, %eax
; X86-NOBMI-NEXT: mull %esi
; X86-NOBMI-NEXT: movl %edx, %ecx
; X86-NOBMI-NEXT: addl %ebp, %eax
; X86-NOBMI-NEXT: adcl %ebx, %ecx
; X86-NOBMI-NEXT: setb %al
; X86-NOBMI-NEXT: movzbl %al, %edi
; X86-NOBMI-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-NOBMI-NEXT: mull %esi
; X86-NOBMI-NEXT: addl %ecx, %eax
; X86-NOBMI-NEXT: adcl %edi, %edx
; X86-NOBMI-NEXT: popl %esi
; X86-NOBMI-NEXT: popl %edi
; X86-NOBMI-NEXT: popl %ebx
; X86-NOBMI-NEXT: popl %ebp
; X86-NOBMI-NEXT: retl
;
; X86-BMI-LABEL: foo:
; X86-BMI: # %bb.0:
; X86-BMI-NEXT: pushl %ebp
; X86-BMI-NEXT: pushl %ebx
; X86-BMI-NEXT: pushl %edi
; X86-BMI-NEXT: pushl %esi
; X86-BMI-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-BMI-NEXT: movl {{[0-9]+}}(%esp), %ecx
; X86-BMI-NEXT: movl {{[0-9]+}}(%esp), %esi
; X86-BMI-NEXT: movl {{[0-9]+}}(%esp), %edi
; X86-BMI-NEXT: movl %eax, %edx
; X86-BMI-NEXT: mulxl %esi, %ebx, %ebx
; X86-BMI-NEXT: movl %ecx, %edx
; X86-BMI-NEXT: mulxl %esi, %esi, %ebp
; X86-BMI-NEXT: addl %ebx, %esi
; X86-BMI-NEXT: adcl $0, %ebp
; X86-BMI-NEXT: movl %eax, %edx
; X86-BMI-NEXT: mulxl %edi, %eax, %ebx
; X86-BMI-NEXT: addl %esi, %eax
; X86-BMI-NEXT: adcl %ebp, %ebx
; X86-BMI-NEXT: setb %al
; X86-BMI-NEXT: movzbl %al, %esi
; X86-BMI-NEXT: movl %ecx, %edx
; X86-BMI-NEXT: mulxl %edi, %eax, %edx
; X86-BMI-NEXT: addl %ebx, %eax
; X86-BMI-NEXT: adcl %esi, %edx
; X86-BMI-NEXT: popl %esi
; X86-BMI-NEXT: popl %edi
; X86-BMI-NEXT: popl %ebx
; X86-BMI-NEXT: popl %ebp
; X86-BMI-NEXT: retl
;
; X64-NOBMI-LABEL: foo:
; X64-NOBMI: # %bb.0:
; X64-NOBMI-NEXT: movq %rdi, %rax
; X64-NOBMI-NEXT: mulq %rsi
; X64-NOBMI-NEXT: movq %rdx, %rax
; X64-NOBMI-NEXT: retq
;
; X64-BMI-LABEL: foo:
; X64-BMI: # %bb.0:
; X64-BMI-NEXT: movq %rdi, %rdx
; X64-BMI-NEXT: mulxq %rsi, %rax, %rax
; X64-BMI-NEXT: retq
%tmp0 = zext i64 %x to i128
%tmp1 = zext i64 %y to i128
%tmp2 = mul i128 %tmp0, %tmp1
%tmp7 = zext i32 64 to i128
%tmp3 = lshr i128 %tmp2, %tmp7
%tmp4 = trunc i128 %tmp3 to i64
ret i64 %tmp4
}
; <rdar://problem/14096009> superfluous multiply by high part of
; zero-extended value.
define i64 @mul1(i64 %n, i64* nocapture %z, i64* nocapture %x, i64 %y) nounwind {
; X86-NOBMI-LABEL: mul1:
; X86-NOBMI: # %bb.0: # %entry
; X86-NOBMI-NEXT: pushl %ebp
; X86-NOBMI-NEXT: pushl %ebx
; X86-NOBMI-NEXT: pushl %edi
; X86-NOBMI-NEXT: pushl %esi
; X86-NOBMI-NEXT: subl $24, %esp
; X86-NOBMI-NEXT: movl {{[0-9]+}}(%esp), %ecx
; X86-NOBMI-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-NOBMI-NEXT: orl %ecx, %eax
; X86-NOBMI-NEXT: je .LBB1_3
; X86-NOBMI-NEXT: # %bb.1: # %for.body.preheader
; X86-NOBMI-NEXT: xorl %eax, %eax
; X86-NOBMI-NEXT: xorl %edx, %edx
; X86-NOBMI-NEXT: xorl %ebp, %ebp
; X86-NOBMI-NEXT: movl $0, (%esp) # 4-byte Folded Spill
; X86-NOBMI-NEXT: .p2align 4, 0x90
; X86-NOBMI-NEXT: .LBB1_2: # %for.body
; X86-NOBMI-NEXT: # =>This Inner Loop Header: Depth=1
; X86-NOBMI-NEXT: movl %edx, {{[-0-9]+}}(%e{{[sb]}}p) # 4-byte Spill
; X86-NOBMI-NEXT: movl %eax, {{[-0-9]+}}(%e{{[sb]}}p) # 4-byte Spill
; X86-NOBMI-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-NOBMI-NEXT: movl (%eax,%ebp,8), %esi
; X86-NOBMI-NEXT: movl 4(%eax,%ebp,8), %ecx
; X86-NOBMI-NEXT: movl %ecx, {{[-0-9]+}}(%e{{[sb]}}p) # 4-byte Spill
; X86-NOBMI-NEXT: movl %esi, %eax
; X86-NOBMI-NEXT: movl {{[0-9]+}}(%esp), %edi
; X86-NOBMI-NEXT: mull %edi
; X86-NOBMI-NEXT: movl %edx, {{[-0-9]+}}(%e{{[sb]}}p) # 4-byte Spill
; X86-NOBMI-NEXT: movl %eax, {{[-0-9]+}}(%e{{[sb]}}p) # 4-byte Spill
; X86-NOBMI-NEXT: movl %ecx, %eax
; X86-NOBMI-NEXT: mull %edi
; X86-NOBMI-NEXT: movl %edx, %ecx
; X86-NOBMI-NEXT: movl %eax, %ebx
; X86-NOBMI-NEXT: addl {{[-0-9]+}}(%e{{[sb]}}p), %ebx # 4-byte Folded Reload
; X86-NOBMI-NEXT: adcl $0, %ecx
; X86-NOBMI-NEXT: movl %esi, %eax
; X86-NOBMI-NEXT: movl {{[0-9]+}}(%esp), %edx
; X86-NOBMI-NEXT: mull %edx
; X86-NOBMI-NEXT: movl %edx, %esi
; X86-NOBMI-NEXT: movl %eax, %edi
; X86-NOBMI-NEXT: addl %ebx, %edi
; X86-NOBMI-NEXT: adcl %ecx, %esi
; X86-NOBMI-NEXT: setb %bl
; X86-NOBMI-NEXT: movl {{[-0-9]+}}(%e{{[sb]}}p), %eax # 4-byte Reload
; X86-NOBMI-NEXT: mull {{[0-9]+}}(%esp)
; X86-NOBMI-NEXT: addl %esi, %eax
; X86-NOBMI-NEXT: movzbl %bl, %esi
; X86-NOBMI-NEXT: movl {{[0-9]+}}(%esp), %ebx
; X86-NOBMI-NEXT: adcl %esi, %edx
; X86-NOBMI-NEXT: movl {{[-0-9]+}}(%e{{[sb]}}p), %ecx # 4-byte Reload
; X86-NOBMI-NEXT: addl {{[-0-9]+}}(%e{{[sb]}}p), %ecx # 4-byte Folded Reload
; X86-NOBMI-NEXT: adcl {{[-0-9]+}}(%e{{[sb]}}p), %edi # 4-byte Folded Reload
; X86-NOBMI-NEXT: adcl $0, %eax
; X86-NOBMI-NEXT: adcl $0, %edx
; X86-NOBMI-NEXT: movl {{[0-9]+}}(%esp), %esi
; X86-NOBMI-NEXT: movl %ecx, (%esi,%ebp,8)
; X86-NOBMI-NEXT: movl %edi, 4(%esi,%ebp,8)
; X86-NOBMI-NEXT: addl $1, %ebp
; X86-NOBMI-NEXT: movl (%esp), %edi # 4-byte Reload
; X86-NOBMI-NEXT: adcl $0, %edi
; X86-NOBMI-NEXT: movl %ebp, %esi
; X86-NOBMI-NEXT: xorl %ebx, %esi
; X86-NOBMI-NEXT: movl %edi, (%esp) # 4-byte Spill
; X86-NOBMI-NEXT: xorl {{[0-9]+}}(%esp), %edi
; X86-NOBMI-NEXT: orl %esi, %edi
; X86-NOBMI-NEXT: jne .LBB1_2
; X86-NOBMI-NEXT: .LBB1_3: # %for.end
; X86-NOBMI-NEXT: xorl %eax, %eax
; X86-NOBMI-NEXT: xorl %edx, %edx
; X86-NOBMI-NEXT: addl $24, %esp
; X86-NOBMI-NEXT: popl %esi
; X86-NOBMI-NEXT: popl %edi
; X86-NOBMI-NEXT: popl %ebx
; X86-NOBMI-NEXT: popl %ebp
; X86-NOBMI-NEXT: retl
;
; X86-BMI-LABEL: mul1:
; X86-BMI: # %bb.0: # %entry
; X86-BMI-NEXT: pushl %ebp
; X86-BMI-NEXT: pushl %ebx
; X86-BMI-NEXT: pushl %edi
; X86-BMI-NEXT: pushl %esi
; X86-BMI-NEXT: subl $16, %esp
; X86-BMI-NEXT: movl {{[0-9]+}}(%esp), %ecx
; X86-BMI-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-BMI-NEXT: orl %ecx, %eax
; X86-BMI-NEXT: je .LBB1_3
; X86-BMI-NEXT: # %bb.1: # %for.body.preheader
; X86-BMI-NEXT: xorl %ecx, %ecx
; X86-BMI-NEXT: xorl %edx, %edx
; X86-BMI-NEXT: xorl %ebx, %ebx
; X86-BMI-NEXT: xorl %ebp, %ebp
; X86-BMI-NEXT: .p2align 4, 0x90
; X86-BMI-NEXT: .LBB1_2: # %for.body
; X86-BMI-NEXT: # =>This Inner Loop Header: Depth=1
; X86-BMI-NEXT: movl %edx, {{[-0-9]+}}(%e{{[sb]}}p) # 4-byte Spill
; X86-BMI-NEXT: movl %ecx, {{[-0-9]+}}(%e{{[sb]}}p) # 4-byte Spill
; X86-BMI-NEXT: movl {{[0-9]+}}(%esp), %ecx
; X86-BMI-NEXT: movl (%ecx,%ebx,8), %eax
; X86-BMI-NEXT: movl 4(%ecx,%ebx,8), %esi
; X86-BMI-NEXT: movl %esi, (%esp) # 4-byte Spill
; X86-BMI-NEXT: movl %eax, %edx
; X86-BMI-NEXT: movl {{[0-9]+}}(%esp), %ecx
; X86-BMI-NEXT: mulxl %ecx, %edx, %edi
; X86-BMI-NEXT: movl %edx, {{[-0-9]+}}(%e{{[sb]}}p) # 4-byte Spill
; X86-BMI-NEXT: movl %esi, %edx
; X86-BMI-NEXT: mulxl %ecx, %esi, %ecx
; X86-BMI-NEXT: addl %edi, %esi
; X86-BMI-NEXT: adcl $0, %ecx
; X86-BMI-NEXT: movl %eax, %edx
; X86-BMI-NEXT: mulxl {{[0-9]+}}(%esp), %edi, %eax
; X86-BMI-NEXT: addl %esi, %edi
; X86-BMI-NEXT: adcl %ecx, %eax
; X86-BMI-NEXT: movl (%esp), %edx # 4-byte Reload
; X86-BMI-NEXT: mulxl {{[0-9]+}}(%esp), %ecx, %edx
; X86-BMI-NEXT: setb (%esp) # 1-byte Folded Spill
; X86-BMI-NEXT: addl %eax, %ecx
; X86-BMI-NEXT: movzbl (%esp), %eax # 1-byte Folded Reload
; X86-BMI-NEXT: adcl %eax, %edx
; X86-BMI-NEXT: movl {{[-0-9]+}}(%e{{[sb]}}p), %esi # 4-byte Reload
; X86-BMI-NEXT: addl {{[-0-9]+}}(%e{{[sb]}}p), %esi # 4-byte Folded Reload
; X86-BMI-NEXT: adcl {{[-0-9]+}}(%e{{[sb]}}p), %edi # 4-byte Folded Reload
; X86-BMI-NEXT: adcl $0, %ecx
; X86-BMI-NEXT: adcl $0, %edx
; X86-BMI-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-BMI-NEXT: movl %esi, (%eax,%ebx,8)
; X86-BMI-NEXT: movl %edi, 4(%eax,%ebx,8)
; X86-BMI-NEXT: movl {{[0-9]+}}(%esp), %edi
; X86-BMI-NEXT: addl $1, %ebx
; X86-BMI-NEXT: adcl $0, %ebp
; X86-BMI-NEXT: movl %ebx, %eax
; X86-BMI-NEXT: xorl {{[0-9]+}}(%esp), %eax
; X86-BMI-NEXT: movl %ebp, %esi
; X86-BMI-NEXT: xorl %edi, %esi
; X86-BMI-NEXT: orl %eax, %esi
; X86-BMI-NEXT: jne .LBB1_2
; X86-BMI-NEXT: .LBB1_3: # %for.end
; X86-BMI-NEXT: xorl %eax, %eax
; X86-BMI-NEXT: xorl %edx, %edx
; X86-BMI-NEXT: addl $16, %esp
; X86-BMI-NEXT: popl %esi
; X86-BMI-NEXT: popl %edi
; X86-BMI-NEXT: popl %ebx
; X86-BMI-NEXT: popl %ebp
; X86-BMI-NEXT: retl
;
; X64-NOBMI-LABEL: mul1:
; X64-NOBMI: # %bb.0: # %entry
; X64-NOBMI-NEXT: testq %rdi, %rdi
; X64-NOBMI-NEXT: je .LBB1_3
; X64-NOBMI-NEXT: # %bb.1: # %for.body.preheader
; X64-NOBMI-NEXT: movq %rcx, %r8
; X64-NOBMI-NEXT: movq %rdx, %r9
; X64-NOBMI-NEXT: xorl %r10d, %r10d
; X64-NOBMI-NEXT: xorl %ecx, %ecx
; X64-NOBMI-NEXT: .p2align 4, 0x90
; X64-NOBMI-NEXT: .LBB1_2: # %for.body
; X64-NOBMI-NEXT: # =>This Inner Loop Header: Depth=1
; X64-NOBMI-NEXT: movq %r8, %rax
; X64-NOBMI-NEXT: mulq (%r9,%rcx,8)
; X64-NOBMI-NEXT: addq %r10, %rax
; X64-NOBMI-NEXT: adcq $0, %rdx
; X64-NOBMI-NEXT: movq %rax, (%rsi,%rcx,8)
; X64-NOBMI-NEXT: incq %rcx
; X64-NOBMI-NEXT: cmpq %rcx, %rdi
; X64-NOBMI-NEXT: movq %rdx, %r10
; X64-NOBMI-NEXT: jne .LBB1_2
; X64-NOBMI-NEXT: .LBB1_3: # %for.end
; X64-NOBMI-NEXT: xorl %eax, %eax
; X64-NOBMI-NEXT: retq
;
; X64-BMI-LABEL: mul1:
; X64-BMI: # %bb.0: # %entry
; X64-BMI-NEXT: testq %rdi, %rdi
; X64-BMI-NEXT: je .LBB1_3
; X64-BMI-NEXT: # %bb.1: # %for.body.preheader
; X64-BMI-NEXT: movq %rcx, %r8
; X64-BMI-NEXT: movq %rdx, %r9
; X64-BMI-NEXT: xorl %r10d, %r10d
; X64-BMI-NEXT: xorl %ecx, %ecx
; X64-BMI-NEXT: .p2align 4, 0x90
; X64-BMI-NEXT: .LBB1_2: # %for.body
; X64-BMI-NEXT: # =>This Inner Loop Header: Depth=1
; X64-BMI-NEXT: movq %r8, %rdx
; X64-BMI-NEXT: mulxq (%r9,%rcx,8), %rax, %rdx
; X64-BMI-NEXT: addq %r10, %rax
; X64-BMI-NEXT: adcq $0, %rdx
; X64-BMI-NEXT: movq %rax, (%rsi,%rcx,8)
; X64-BMI-NEXT: incq %rcx
; X64-BMI-NEXT: cmpq %rcx, %rdi
; X64-BMI-NEXT: movq %rdx, %r10
; X64-BMI-NEXT: jne .LBB1_2
; X64-BMI-NEXT: .LBB1_3: # %for.end
; X64-BMI-NEXT: xorl %eax, %eax
; X64-BMI-NEXT: retq
entry:
%conv = zext i64 %y to i128
%cmp11 = icmp eq i64 %n, 0
br i1 %cmp11, label %for.end, label %for.body
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
}
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