Index: lib/Target/X86/X86SchedHaswell.td =================================================================== --- lib/Target/X86/X86SchedHaswell.td +++ lib/Target/X86/X86SchedHaswell.td @@ -1848,4 +1848,34 @@ def: InstRW<[WriteZero], (instrs CLC)>; +// The 0x83 ADC/SBB opcodes have special support for immediate 0 to only require +// a single uop. It does not apply to the GR8 encoding. And only applies to the +// 8-bit immediate since using larger immediate for 0 would be silly. +// Unfortunately, this optimization does not apply to the AX/EAX/RAX short +// encodings we convert to in MCInstLowering so we exclude AX/EAX/RAX here since +// we schedule before that point. +// TODO: Should we disable using the short encodings on these CPUs? +def HWFastADC0 : MCSchedPredicate< + CheckAll<[ + CheckImmOperand<2, 0>, // Second MCOperand is Imm and has value 0. + CheckNot>, // First MCOperand is not register AX + CheckNot>, // First MCOperand is not register EAX + CheckNot> // First MCOperand is not register RAX + ]> +>; + +def HWWriteADC0 : SchedWriteRes<[HWPort06]> { + let Latency = 1; + let NumMicroOps = 1; + let ResourceCycles = [1]; +} + +def HWWriteADC : SchedWriteVariant<[ + SchedVar, + SchedVar +]>; + +def : InstRW<[HWWriteADC], (instrs ADC16ri8, ADC32ri8, ADC64ri8, + SBB16ri8, SBB32ri8, SBB64ri8)>; + } // SchedModel Index: test/tools/llvm-mca/X86/Haswell/resources-x86_64.s =================================================================== --- test/tools/llvm-mca/X86/Haswell/resources-x86_64.s +++ test/tools/llvm-mca/X86/Haswell/resources-x86_64.s @@ -909,7 +909,7 @@ # CHECK-NEXT: 6 9 1.00 * * adcb %sil, (%rax) # CHECK-NEXT: 3 7 0.50 * adcb (%rax), %dil # CHECK-NEXT: 2 2 0.50 adcw $0, %ax -# CHECK-NEXT: 2 2 0.50 adcw $0, %di +# CHECK-NEXT: 1 1 0.50 adcw $0, %di # CHECK-NEXT: 6 9 1.00 * * adcw $0, (%rax) # CHECK-NEXT: 2 2 0.50 adcw $511, %ax # CHECK-NEXT: 2 2 0.50 adcw $511, %di @@ -920,7 +920,7 @@ # CHECK-NEXT: 6 9 1.00 * * adcw %si, (%rax) # CHECK-NEXT: 3 7 0.50 * adcw (%rax), %di # CHECK-NEXT: 2 2 0.50 adcl $0, %eax -# CHECK-NEXT: 2 2 0.50 adcl $0, %edi +# CHECK-NEXT: 1 1 0.50 adcl $0, %edi # CHECK-NEXT: 6 9 1.00 * * adcl $0, (%rax) # CHECK-NEXT: 2 2 0.50 adcl $665536, %eax # CHECK-NEXT: 2 2 0.50 adcl $665536, %edi @@ -931,7 +931,7 @@ # CHECK-NEXT: 6 9 1.00 * * adcl %esi, (%rax) # CHECK-NEXT: 3 7 0.50 * adcl (%rax), %edi # CHECK-NEXT: 2 2 0.50 adcq $0, %rax -# CHECK-NEXT: 2 2 0.50 adcq $0, %rdi +# CHECK-NEXT: 1 1 0.50 adcq $0, %rdi # CHECK-NEXT: 6 9 1.00 * * adcq $0, (%rax) # CHECK-NEXT: 2 2 0.50 adcq $665536, %rax # CHECK-NEXT: 2 2 0.50 adcq $665536, %rdi @@ -1472,7 +1472,7 @@ # CHECK-NEXT: 6 9 1.00 * * sbbb %sil, (%rax) # CHECK-NEXT: 3 7 0.50 * sbbb (%rax), %dil # CHECK-NEXT: 2 2 0.50 sbbw $0, %ax -# CHECK-NEXT: 2 2 0.50 sbbw $0, %di +# CHECK-NEXT: 1 1 0.50 sbbw $0, %di # CHECK-NEXT: 6 9 1.00 * * sbbw $0, (%rax) # CHECK-NEXT: 2 2 0.50 sbbw $511, %ax # CHECK-NEXT: 2 2 0.50 sbbw $511, %di @@ -1483,7 +1483,7 @@ # CHECK-NEXT: 6 9 1.00 * * sbbw %si, (%rax) # CHECK-NEXT: 3 7 0.50 * sbbw (%rax), %di # CHECK-NEXT: 2 2 0.50 sbbl $0, %eax -# CHECK-NEXT: 2 2 0.50 sbbl $0, %edi +# CHECK-NEXT: 1 1 0.50 sbbl $0, %edi # CHECK-NEXT: 6 9 1.00 * * sbbl $0, (%rax) # CHECK-NEXT: 2 2 0.50 sbbl $665536, %eax # CHECK-NEXT: 2 2 0.50 sbbl $665536, %edi @@ -1494,7 +1494,7 @@ # CHECK-NEXT: 6 9 1.00 * * sbbl %esi, (%rax) # CHECK-NEXT: 3 7 0.50 * sbbl (%rax), %edi # CHECK-NEXT: 2 2 0.50 sbbq $0, %rax -# CHECK-NEXT: 2 2 0.50 sbbq $0, %rdi +# CHECK-NEXT: 1 1 0.50 sbbq $0, %rdi # CHECK-NEXT: 6 9 1.00 * * sbbq $0, (%rax) # CHECK-NEXT: 2 2 0.50 sbbq $665536, %rax # CHECK-NEXT: 2 2 0.50 sbbq $665536, %rdi @@ -1693,7 +1693,7 @@ # CHECK: Resource pressure per iteration: # CHECK-NEXT: [0] [1] [2] [3] [4] [5] [6] [7] [8] [9] -# CHECK-NEXT: 80.00 - 579.25 373.25 269.83 269.83 209.00 287.75 641.75 82.33 +# CHECK-NEXT: 80.00 - 577.75 371.75 269.83 269.83 209.00 286.25 640.25 82.33 # CHECK: Resource pressure by instruction: # CHECK-NEXT: [0] [1] [2] [3] [4] [5] [6] [7] [8] [9] Instructions: @@ -1707,7 +1707,7 @@ # CHECK-NEXT: - - 1.25 0.25 0.83 0.83 1.00 0.25 1.25 0.33 adcb %sil, (%rax) # CHECK-NEXT: - - 0.75 0.25 0.50 0.50 - 0.25 0.75 - adcb (%rax), %dil # CHECK-NEXT: - - 0.75 0.25 - - - 0.25 0.75 - adcw $0, %ax -# CHECK-NEXT: - - 0.75 0.25 - - - 0.25 0.75 - adcw $0, %di +# CHECK-NEXT: - - 0.50 - - - - - 0.50 - adcw $0, %di # CHECK-NEXT: - - 1.25 0.25 0.83 0.83 1.00 0.25 1.25 0.33 adcw $0, (%rax) # CHECK-NEXT: - - 0.75 0.25 - - - 0.25 0.75 - adcw $511, %ax # CHECK-NEXT: - - 0.75 0.25 - - - 0.25 0.75 - adcw $511, %di @@ -1718,7 +1718,7 @@ # CHECK-NEXT: - - 1.25 0.25 0.83 0.83 1.00 0.25 1.25 0.33 adcw %si, (%rax) # CHECK-NEXT: - - 0.75 0.25 0.50 0.50 - 0.25 0.75 - adcw (%rax), %di # CHECK-NEXT: - - 0.75 0.25 - - - 0.25 0.75 - adcl $0, %eax -# CHECK-NEXT: - - 0.75 0.25 - - - 0.25 0.75 - adcl $0, %edi +# CHECK-NEXT: - - 0.50 - - - - - 0.50 - adcl $0, %edi # CHECK-NEXT: - - 1.25 0.25 0.83 0.83 1.00 0.25 1.25 0.33 adcl $0, (%rax) # CHECK-NEXT: - - 0.75 0.25 - - - 0.25 0.75 - adcl $665536, %eax # CHECK-NEXT: - - 0.75 0.25 - - - 0.25 0.75 - adcl $665536, %edi @@ -1729,7 +1729,7 @@ # CHECK-NEXT: - - 1.25 0.25 0.83 0.83 1.00 0.25 1.25 0.33 adcl %esi, (%rax) # CHECK-NEXT: - - 0.75 0.25 0.50 0.50 - 0.25 0.75 - adcl (%rax), %edi # CHECK-NEXT: - - 0.75 0.25 - - - 0.25 0.75 - adcq $0, %rax -# CHECK-NEXT: - - 0.75 0.25 - - - 0.25 0.75 - adcq $0, %rdi +# CHECK-NEXT: - - 0.50 - - - - - 0.50 - adcq $0, %rdi # CHECK-NEXT: - - 1.25 0.25 0.83 0.83 1.00 0.25 1.25 0.33 adcq $0, (%rax) # CHECK-NEXT: - - 0.75 0.25 - - - 0.25 0.75 - adcq $665536, %rax # CHECK-NEXT: - - 0.75 0.25 - - - 0.25 0.75 - adcq $665536, %rdi @@ -2270,7 +2270,7 @@ # CHECK-NEXT: - - 1.25 0.25 0.83 0.83 1.00 0.25 1.25 0.33 sbbb %sil, (%rax) # CHECK-NEXT: - - 0.75 0.25 0.50 0.50 - 0.25 0.75 - sbbb (%rax), %dil # CHECK-NEXT: - - 0.75 0.25 - - - 0.25 0.75 - sbbw $0, %ax -# CHECK-NEXT: - - 0.75 0.25 - - - 0.25 0.75 - sbbw $0, %di +# CHECK-NEXT: - - 0.50 - - - - - 0.50 - sbbw $0, %di # CHECK-NEXT: - - 1.25 0.25 0.83 0.83 1.00 0.25 1.25 0.33 sbbw $0, (%rax) # CHECK-NEXT: - - 0.75 0.25 - - - 0.25 0.75 - sbbw $511, %ax # CHECK-NEXT: - - 0.75 0.25 - - - 0.25 0.75 - sbbw $511, %di @@ -2281,7 +2281,7 @@ # CHECK-NEXT: - - 1.25 0.25 0.83 0.83 1.00 0.25 1.25 0.33 sbbw %si, (%rax) # CHECK-NEXT: - - 0.75 0.25 0.50 0.50 - 0.25 0.75 - sbbw (%rax), %di # CHECK-NEXT: - - 0.75 0.25 - - - 0.25 0.75 - sbbl $0, %eax -# CHECK-NEXT: - - 0.75 0.25 - - - 0.25 0.75 - sbbl $0, %edi +# CHECK-NEXT: - - 0.50 - - - - - 0.50 - sbbl $0, %edi # CHECK-NEXT: - - 1.25 0.25 0.83 0.83 1.00 0.25 1.25 0.33 sbbl $0, (%rax) # CHECK-NEXT: - - 0.75 0.25 - - - 0.25 0.75 - sbbl $665536, %eax # CHECK-NEXT: - - 0.75 0.25 - - - 0.25 0.75 - sbbl $665536, %edi @@ -2292,7 +2292,7 @@ # CHECK-NEXT: - - 1.25 0.25 0.83 0.83 1.00 0.25 1.25 0.33 sbbl %esi, (%rax) # CHECK-NEXT: - - 0.75 0.25 0.50 0.50 - 0.25 0.75 - sbbl (%rax), %edi # CHECK-NEXT: - - 0.75 0.25 - - - 0.25 0.75 - sbbq $0, %rax -# CHECK-NEXT: - - 0.75 0.25 - - - 0.25 0.75 - sbbq $0, %rdi +# CHECK-NEXT: - - 0.50 - - - - - 0.50 - sbbq $0, %rdi # CHECK-NEXT: - - 1.25 0.25 0.83 0.83 1.00 0.25 1.25 0.33 sbbq $0, (%rax) # CHECK-NEXT: - - 0.75 0.25 - - - 0.25 0.75 - sbbq $665536, %rax # CHECK-NEXT: - - 0.75 0.25 - - - 0.25 0.75 - sbbq $665536, %rdi