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e2e0a9d886
The default promotion for the add_sat/sub_sat nodes currently does:
ANY_EXTEND iN to iM
SHL by M-N
[US][ADD|SUB]SAT
L/ASHR by M-N
If the promoted add_sat or sub_sat node is not legal, this can produce code
that effectively does a lot of shifting (and requiring large constants to be
materialised) just to use the overflow flag. It is simpler to just do the
saturation manually, using the higher bitwidth addition and a min/max against
the saturating bounds. That is what this patch attempts to do.
Differential Revision: https://reviews.llvm.org/D68926
llvm-svn: 375211
208 lines
6.2 KiB
LLVM
208 lines
6.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=i686 -mattr=cmov | FileCheck %s --check-prefixes=CHECK,X86
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; RUN: llc < %s -mtriple=x86_64-linux | FileCheck %s --check-prefixes=CHECK,X64
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declare i4 @llvm.sadd.sat.i4(i4, i4)
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declare i8 @llvm.sadd.sat.i8(i8, i8)
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declare i16 @llvm.sadd.sat.i16(i16, i16)
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declare i32 @llvm.sadd.sat.i32(i32, i32)
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declare i64 @llvm.sadd.sat.i64(i64, i64)
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define i32 @func32(i32 %x, i32 %y, i32 %z) nounwind {
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; X86-LABEL: func32:
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; X86: # %bb.0:
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; X86-NEXT: pushl %esi
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; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
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; X86-NEXT: imull {{[0-9]+}}(%esp), %eax
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; X86-NEXT: movl {{[0-9]+}}(%esp), %edx
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; X86-NEXT: xorl %ecx, %ecx
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; X86-NEXT: movl %eax, %esi
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; X86-NEXT: addl %edx, %esi
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; X86-NEXT: setns %cl
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; X86-NEXT: addl $2147483647, %ecx # imm = 0x7FFFFFFF
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; X86-NEXT: addl %edx, %eax
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; X86-NEXT: cmovol %ecx, %eax
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; X86-NEXT: popl %esi
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; X86-NEXT: retl
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;
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; X64-LABEL: func32:
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; X64: # %bb.0:
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; X64-NEXT: imull %edx, %esi
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; X64-NEXT: xorl %eax, %eax
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; X64-NEXT: movl %edi, %ecx
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; X64-NEXT: addl %esi, %ecx
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; X64-NEXT: setns %al
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; X64-NEXT: addl $2147483647, %eax # imm = 0x7FFFFFFF
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; X64-NEXT: addl %edi, %esi
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; X64-NEXT: cmovnol %esi, %eax
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; X64-NEXT: retq
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%a = mul i32 %y, %z
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%tmp = call i32 @llvm.sadd.sat.i32(i32 %x, i32 %a)
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ret i32 %tmp
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}
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define i64 @func64(i64 %x, i64 %y, i64 %z) nounwind {
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; X86-LABEL: func64:
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; X86: # %bb.0:
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; X86-NEXT: pushl %ebp
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; X86-NEXT: pushl %ebx
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; X86-NEXT: pushl %edi
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; X86-NEXT: pushl %esi
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; X86-NEXT: movl {{[0-9]+}}(%esp), %esi
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; X86-NEXT: movl {{[0-9]+}}(%esp), %edi
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; X86-NEXT: movl {{[0-9]+}}(%esp), %ebx
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; X86-NEXT: addl {{[0-9]+}}(%esp), %edi
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; X86-NEXT: movl %ebx, %ebp
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; X86-NEXT: adcl %esi, %ebp
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; X86-NEXT: movl %ebp, %eax
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; X86-NEXT: sarl $31, %eax
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; X86-NEXT: xorl %ecx, %ecx
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; X86-NEXT: testl %ebp, %ebp
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; X86-NEXT: setns %cl
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; X86-NEXT: movl %ecx, %edx
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; X86-NEXT: addl $2147483647, %edx # imm = 0x7FFFFFFF
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; X86-NEXT: testl %ebx, %ebx
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; X86-NEXT: setns %bl
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; X86-NEXT: cmpb %cl, %bl
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; X86-NEXT: setne %cl
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; X86-NEXT: testl %esi, %esi
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; X86-NEXT: setns %ch
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; X86-NEXT: cmpb %ch, %bl
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; X86-NEXT: sete %ch
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; X86-NEXT: testb %cl, %ch
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; X86-NEXT: cmovel %ebp, %edx
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; X86-NEXT: cmovel %edi, %eax
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; X86-NEXT: popl %esi
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; X86-NEXT: popl %edi
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; X86-NEXT: popl %ebx
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; X86-NEXT: popl %ebp
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; X86-NEXT: retl
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;
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; X64-LABEL: func64:
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; X64: # %bb.0:
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; X64-NEXT: xorl %ecx, %ecx
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; X64-NEXT: movq %rdi, %rax
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; X64-NEXT: addq %rdx, %rax
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; X64-NEXT: setns %cl
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; X64-NEXT: movabsq $9223372036854775807, %rax # imm = 0x7FFFFFFFFFFFFFFF
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; X64-NEXT: addq %rcx, %rax
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; X64-NEXT: addq %rdx, %rdi
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; X64-NEXT: cmovnoq %rdi, %rax
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; X64-NEXT: retq
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%a = mul i64 %y, %z
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%tmp = call i64 @llvm.sadd.sat.i64(i64 %x, i64 %z)
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ret i64 %tmp
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}
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define signext i16 @func16(i16 signext %x, i16 signext %y, i16 signext %z) nounwind {
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; X86-LABEL: func16:
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; X86: # %bb.0:
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; X86-NEXT: pushl %esi
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; X86-NEXT: movzwl {{[0-9]+}}(%esp), %eax
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; X86-NEXT: imulw {{[0-9]+}}(%esp), %ax
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; X86-NEXT: movzwl {{[0-9]+}}(%esp), %edx
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; X86-NEXT: xorl %ecx, %ecx
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; X86-NEXT: movl %eax, %esi
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; X86-NEXT: addw %dx, %si
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; X86-NEXT: setns %cl
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; X86-NEXT: addl $32767, %ecx # imm = 0x7FFF
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; X86-NEXT: addw %dx, %ax
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; X86-NEXT: cmovol %ecx, %eax
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; X86-NEXT: # kill: def $ax killed $ax killed $eax
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; X86-NEXT: popl %esi
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; X86-NEXT: retl
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;
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; X64-LABEL: func16:
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; X64: # %bb.0:
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; X64-NEXT: imull %edx, %esi
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; X64-NEXT: xorl %eax, %eax
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; X64-NEXT: movl %edi, %ecx
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; X64-NEXT: addw %si, %cx
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; X64-NEXT: setns %al
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; X64-NEXT: addl $32767, %eax # imm = 0x7FFF
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; X64-NEXT: addw %si, %di
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; X64-NEXT: cmovnol %edi, %eax
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; X64-NEXT: # kill: def $ax killed $ax killed $eax
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; X64-NEXT: retq
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%a = mul i16 %y, %z
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%tmp = call i16 @llvm.sadd.sat.i16(i16 %x, i16 %a)
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ret i16 %tmp
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}
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define signext i8 @func8(i8 signext %x, i8 signext %y, i8 signext %z) nounwind {
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; X86-LABEL: func8:
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; X86: # %bb.0:
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; X86-NEXT: movb {{[0-9]+}}(%esp), %al
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; X86-NEXT: mulb {{[0-9]+}}(%esp)
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; X86-NEXT: movb {{[0-9]+}}(%esp), %dl
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; X86-NEXT: xorl %ecx, %ecx
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; X86-NEXT: movb %al, %ah
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; X86-NEXT: addb %dl, %ah
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; X86-NEXT: setns %cl
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; X86-NEXT: addl $127, %ecx
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; X86-NEXT: addb %dl, %al
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; X86-NEXT: movzbl %al, %eax
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; X86-NEXT: cmovol %ecx, %eax
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; X86-NEXT: # kill: def $al killed $al killed $eax
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; X86-NEXT: retl
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;
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; X64-LABEL: func8:
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; X64: # %bb.0:
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; X64-NEXT: movl %esi, %eax
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; X64-NEXT: # kill: def $al killed $al killed $eax
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; X64-NEXT: mulb %dl
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; X64-NEXT: xorl %ecx, %ecx
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; X64-NEXT: movl %edi, %edx
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; X64-NEXT: addb %al, %dl
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; X64-NEXT: setns %cl
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; X64-NEXT: addl $127, %ecx
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; X64-NEXT: addb %al, %dil
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; X64-NEXT: movzbl %dil, %eax
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; X64-NEXT: cmovol %ecx, %eax
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; X64-NEXT: # kill: def $al killed $al killed $eax
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; X64-NEXT: retq
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%a = mul i8 %y, %z
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%tmp = call i8 @llvm.sadd.sat.i8(i8 %x, i8 %a)
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ret i8 %tmp
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}
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define signext i4 @func4(i4 signext %x, i4 signext %y, i4 signext %z) nounwind {
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; X86-LABEL: func4:
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; X86: # %bb.0:
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; X86-NEXT: movb {{[0-9]+}}(%esp), %al
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; X86-NEXT: mulb {{[0-9]+}}(%esp)
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; X86-NEXT: shlb $4, %al
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; X86-NEXT: sarb $4, %al
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; X86-NEXT: addb {{[0-9]+}}(%esp), %al
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; X86-NEXT: movzbl %al, %ecx
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; X86-NEXT: cmpb $7, %al
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; X86-NEXT: movl $7, %eax
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; X86-NEXT: cmovll %ecx, %eax
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; X86-NEXT: cmpb $-8, %al
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; X86-NEXT: movl $248, %ecx
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; X86-NEXT: cmovgl %eax, %ecx
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; X86-NEXT: movsbl %cl, %eax
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; X86-NEXT: retl
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;
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; X64-LABEL: func4:
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; X64: # %bb.0:
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; X64-NEXT: movl %esi, %eax
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; X64-NEXT: # kill: def $al killed $al killed $eax
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; X64-NEXT: mulb %dl
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; X64-NEXT: shlb $4, %al
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; X64-NEXT: sarb $4, %al
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; X64-NEXT: addb %dil, %al
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; X64-NEXT: movzbl %al, %eax
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; X64-NEXT: cmpb $7, %al
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; X64-NEXT: movl $7, %ecx
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; X64-NEXT: cmovll %eax, %ecx
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; X64-NEXT: cmpb $-8, %cl
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; X64-NEXT: movl $248, %eax
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; X64-NEXT: cmovgl %ecx, %eax
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; X64-NEXT: movsbl %al, %eax
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; X64-NEXT: retq
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%a = mul i4 %y, %z
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%tmp = call i4 @llvm.sadd.sat.i4(i4 %x, i4 %a)
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ret i4 %tmp
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}
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