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[SelectionDAG] Fix miscompile bugs related to smul.fix.sat with scale zero
When expanding a SMULFIXSAT ISD node (usually originating from a smul.fix.sat intrinsic) we've applied some optimizations for the special case when the scale is zero. The idea has been that it would be cheaper to use an SMULO instruction (if legal) to perform the multiplication and at the same time detect any overflow. And in case of overflow we could use some SELECT:s to replace the result with the saturated min/max value. The only tricky part is to know if we overflowed on the min or max value, i.e. if the product is positive or negative. Unfortunately the implementation has been incorrect as it has looked at the product returned by the SMULO to determine the sign of the product. In case of overflow that product is truncated and won't give us the correct sign bit. This patch is adding an extra XOR of the multiplication operands, which is used to determine the sign of the non truncated product. This patch fixes PR51677. Reviewed By: lebedev.ri Differential Revision: https://reviews.llvm.org/D108938 (cherry picked from commit 789f01283d52065b10049b58a3288c4abd1ef351)
This commit is contained in:
Bjorn Pettersson
Tom Stellard
parent
4ddceef928
commit
6d1749e6c0
@ -3464,8 +3464,11 @@ void DAGTypeLegalizer::ExpandIntRes_MULFIX(SDNode *N, SDValue &Lo,
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SDValue SatMin = DAG.getConstant(MinVal, dl, VT);
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SDValue SatMax = DAG.getConstant(MaxVal, dl, VT);
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SDValue Zero = DAG.getConstant(0, dl, VT);
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SDValue ProdNeg = DAG.getSetCC(dl, BoolVT, Product, Zero, ISD::SETLT);
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Result = DAG.getSelect(dl, VT, ProdNeg, SatMax, SatMin);
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// Xor the inputs, if resulting sign bit is 0 the product will be
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// positive, else negative.
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SDValue Xor = DAG.getNode(ISD::XOR, dl, VT, LHS, RHS);
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SDValue ProdNeg = DAG.getSetCC(dl, BoolVT, Xor, Zero, ISD::SETLT);
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Result = DAG.getSelect(dl, VT, ProdNeg, SatMin, SatMax);
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Result = DAG.getSelect(dl, VT, Overflow, Result, Product);
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} else {
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// For unsigned multiplication, we only need to check the max since we
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@ -8155,8 +8155,11 @@ TargetLowering::expandFixedPointMul(SDNode *Node, SelectionDAG &DAG) const {
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APInt MaxVal = APInt::getSignedMaxValue(VTSize);
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SDValue SatMin = DAG.getConstant(MinVal, dl, VT);
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SDValue SatMax = DAG.getConstant(MaxVal, dl, VT);
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SDValue ProdNeg = DAG.getSetCC(dl, BoolVT, Product, Zero, ISD::SETLT);
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Result = DAG.getSelect(dl, VT, ProdNeg, SatMax, SatMin);
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// Xor the inputs, if resulting sign bit is 0 the product will be
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// positive, else negative.
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SDValue Xor = DAG.getNode(ISD::XOR, dl, VT, LHS, RHS);
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SDValue ProdNeg = DAG.getSetCC(dl, BoolVT, Xor, Zero, ISD::SETLT);
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Result = DAG.getSelect(dl, VT, ProdNeg, SatMin, SatMax);
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return DAG.getSelect(dl, VT, Overflow, Result, Product);
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} else if (!Signed && isOperationLegalOrCustom(ISD::UMULO, VT)) {
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SDValue Result =
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@ -315,11 +315,10 @@ define <4 x i32> @vec(<4 x i32> %x, <4 x i32> %y) nounwind {
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define i32 @func4(i32 %x, i32 %y) nounwind {
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; X64-LABEL: func4:
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; X64: # %bb.0:
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; X64-NEXT: movl %edi, %ecx
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; X64-NEXT: imull %esi, %ecx
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; X64-NEXT: xorl %eax, %eax
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; X64-NEXT: testl %ecx, %ecx
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; X64-NEXT: setns %al
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; X64-NEXT: movl %edi, %ecx
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; X64-NEXT: xorl %esi, %ecx
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; X64-NEXT: sets %al
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; X64-NEXT: addl $2147483647, %eax # imm = 0x7FFFFFFF
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; X64-NEXT: imull %esi, %edi
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; X64-NEXT: cmovnol %edi, %eax
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@ -328,13 +327,12 @@ define i32 @func4(i32 %x, i32 %y) nounwind {
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; X86-LABEL: func4:
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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: movl {{[0-9]+}}(%esp), %edx
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; X86-NEXT: movl %eax, %esi
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; X86-NEXT: imull %edx, %esi
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; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
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; X86-NEXT: xorl %ecx, %ecx
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; X86-NEXT: testl %esi, %esi
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; X86-NEXT: setns %cl
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; X86-NEXT: movl %eax, %esi
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; X86-NEXT: xorl %edx, %esi
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; X86-NEXT: sets %cl
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; X86-NEXT: addl $2147483647, %ecx # imm = 0x7FFFFFFF
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; X86-NEXT: imull %edx, %eax
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; X86-NEXT: cmovol %ecx, %eax
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@ -347,11 +345,10 @@ define i32 @func4(i32 %x, i32 %y) nounwind {
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define i64 @func5(i64 %x, i64 %y) {
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; X64-LABEL: func5:
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; X64: # %bb.0:
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; X64-NEXT: movq %rdi, %rax
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; X64-NEXT: imulq %rsi, %rax
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; X64-NEXT: xorl %ecx, %ecx
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; X64-NEXT: testq %rax, %rax
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; X64-NEXT: setns %cl
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; X64-NEXT: movq %rdi, %rax
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; X64-NEXT: xorq %rsi, %rax
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; X64-NEXT: sets %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: imulq %rsi, %rdi
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@ -360,47 +357,58 @@ define i64 @func5(i64 %x, i64 %y) {
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;
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; X86-LABEL: func5:
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; X86: # %bb.0:
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; X86-NEXT: pushl %edi
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; X86-NEXT: pushl %ebp
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; X86-NEXT: .cfi_def_cfa_offset 8
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; X86-NEXT: pushl %esi
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; X86-NEXT: pushl %ebx
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; X86-NEXT: .cfi_def_cfa_offset 12
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; X86-NEXT: pushl %eax
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; X86-NEXT: pushl %edi
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; X86-NEXT: .cfi_def_cfa_offset 16
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; X86-NEXT: .cfi_offset %esi, -12
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; X86-NEXT: .cfi_offset %edi, -8
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; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
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; X86-NEXT: movl {{[0-9]+}}(%esp), %ecx
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; X86-NEXT: pushl %esi
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; X86-NEXT: .cfi_def_cfa_offset 20
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; X86-NEXT: pushl %eax
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; X86-NEXT: .cfi_def_cfa_offset 24
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; X86-NEXT: .cfi_offset %esi, -20
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; X86-NEXT: .cfi_offset %edi, -16
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; X86-NEXT: .cfi_offset %ebx, -12
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; X86-NEXT: .cfi_offset %ebp, -8
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; X86-NEXT: movl {{[0-9]+}}(%esp), %edx
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; X86-NEXT: movl {{[0-9]+}}(%esp), %esi
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; X86-NEXT: movl {{[0-9]+}}(%esp), %ecx
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; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
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; X86-NEXT: movl $0, (%esp)
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; X86-NEXT: movl %esp, %edi
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; X86-NEXT: xorl %ebp, %ebp
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; X86-NEXT: xorl %ebx, %ebx
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; X86-NEXT: movl %eax, %esi
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; X86-NEXT: xorl %ecx, %esi
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; X86-NEXT: movl $-1, %esi
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; X86-NEXT: cmovsl %ebp, %esi
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; X86-NEXT: sets %bl
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; X86-NEXT: addl $2147483647, %ebx # imm = 0x7FFFFFFF
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; X86-NEXT: pushl %edi
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; X86-NEXT: .cfi_adjust_cfa_offset 4
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; X86-NEXT: pushl %esi
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; X86-NEXT: .cfi_adjust_cfa_offset 4
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; X86-NEXT: pushl %edx
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; X86-NEXT: .cfi_adjust_cfa_offset 4
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; X86-NEXT: pushl %ecx
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; X86-NEXT: .cfi_adjust_cfa_offset 4
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; X86-NEXT: pushl %edx
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; X86-NEXT: .cfi_adjust_cfa_offset 4
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; X86-NEXT: pushl %eax
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; X86-NEXT: .cfi_adjust_cfa_offset 4
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; X86-NEXT: pushl {{[0-9]+}}(%esp)
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; X86-NEXT: .cfi_adjust_cfa_offset 4
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; X86-NEXT: calll __mulodi4
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; X86-NEXT: addl $20, %esp
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; X86-NEXT: .cfi_adjust_cfa_offset -20
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; X86-NEXT: xorl %ecx, %ecx
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; X86-NEXT: testl %edx, %edx
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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: movl %edx, %esi
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; X86-NEXT: sarl $31, %esi
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; X86-NEXT: cmpl $0, (%esp)
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; X86-NEXT: cmovnel %esi, %eax
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; X86-NEXT: cmovnel %ecx, %edx
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; X86-NEXT: cmovnel %ebx, %edx
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; X86-NEXT: addl $4, %esp
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; X86-NEXT: .cfi_def_cfa_offset 12
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; X86-NEXT: .cfi_def_cfa_offset 20
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; X86-NEXT: popl %esi
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; X86-NEXT: .cfi_def_cfa_offset 8
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; X86-NEXT: .cfi_def_cfa_offset 16
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; X86-NEXT: popl %edi
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; X86-NEXT: .cfi_def_cfa_offset 12
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; X86-NEXT: popl %ebx
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; X86-NEXT: .cfi_def_cfa_offset 8
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; X86-NEXT: popl %ebp
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; X86-NEXT: .cfi_def_cfa_offset 4
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; X86-NEXT: retl
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%tmp = call i64 @llvm.smul.fix.sat.i64(i64 %x, i64 %y, i32 0)
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@ -414,36 +422,34 @@ define i4 @func6(i4 %x, i4 %y) nounwind {
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; X64-NEXT: shlb $4, %sil
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; X64-NEXT: sarb $4, %sil
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; X64-NEXT: shlb $4, %al
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; X64-NEXT: xorl %ecx, %ecx
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; X64-NEXT: movl %eax, %edx
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; X64-NEXT: xorb %sil, %dl
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; X64-NEXT: sets %cl
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; X64-NEXT: addl $127, %ecx
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; X64-NEXT: # kill: def $al killed $al killed $eax
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; X64-NEXT: imulb %sil
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; X64-NEXT: seto %cl
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; X64-NEXT: xorl %edx, %edx
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; X64-NEXT: testb %al, %al
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; X64-NEXT: setns %dl
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; X64-NEXT: addl $127, %edx
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; X64-NEXT: movzbl %al, %eax
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; X64-NEXT: testb %cl, %cl
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; X64-NEXT: cmovnel %edx, %eax
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; X64-NEXT: cmovol %ecx, %eax
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; X64-NEXT: sarb $4, %al
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; X64-NEXT: # kill: def $al killed $al killed $eax
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; X64-NEXT: retq
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;
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; X86-LABEL: func6:
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; X86: # %bb.0:
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; X86-NEXT: movb {{[0-9]+}}(%esp), %cl
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; X86-NEXT: shlb $4, %cl
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; X86-NEXT: sarb $4, %cl
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; X86-NEXT: movb {{[0-9]+}}(%esp), %dl
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; X86-NEXT: shlb $4, %dl
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; X86-NEXT: sarb $4, %dl
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; X86-NEXT: movb {{[0-9]+}}(%esp), %al
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; X86-NEXT: shlb $4, %al
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; X86-NEXT: imulb %cl
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; X86-NEXT: seto %dl
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; X86-NEXT: xorl %ecx, %ecx
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; X86-NEXT: testb %al, %al
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; X86-NEXT: setns %cl
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; X86-NEXT: movb %al, %ah
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; X86-NEXT: xorb %dl, %ah
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; X86-NEXT: sets %cl
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; X86-NEXT: addl $127, %ecx
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; X86-NEXT: imulb %dl
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; X86-NEXT: movzbl %al, %eax
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; X86-NEXT: testb %dl, %dl
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; X86-NEXT: cmovnel %ecx, %eax
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; X86-NEXT: cmovol %ecx, %eax
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; X86-NEXT: sarb $4, %al
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; X86-NEXT: # kill: def $al killed $al killed $eax
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; X86-NEXT: retl
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@ -454,59 +460,56 @@ define i4 @func6(i4 %x, i4 %y) nounwind {
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define <4 x i32> @vec2(<4 x i32> %x, <4 x i32> %y) nounwind {
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; X64-LABEL: vec2:
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; X64: # %bb.0:
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; X64-NEXT: pshufd {{.*#+}} xmm2 = xmm1[1,1,1,1]
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; X64-NEXT: pshufd {{.*#+}} xmm2 = xmm1[3,3,3,3]
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; X64-NEXT: movd %xmm2, %eax
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; X64-NEXT: pshufd {{.*#+}} xmm2 = xmm0[3,3,3,3]
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; X64-NEXT: movd %xmm2, %ecx
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; X64-NEXT: pshufd {{.*#+}} xmm2 = xmm0[1,1,1,1]
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; X64-NEXT: movd %xmm2, %r8d
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; X64-NEXT: movl %r8d, %edx
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; X64-NEXT: imull %ecx, %edx
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; X64-NEXT: xorl %esi, %esi
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; X64-NEXT: testl %edx, %edx
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; X64-NEXT: setns %sil
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; X64-NEXT: addl $2147483647, %esi # imm = 0x7FFFFFFF
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; X64-NEXT: imull %ecx, %r8d
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; X64-NEXT: cmovol %esi, %r8d
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; X64-NEXT: movd %xmm1, %edx
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; X64-NEXT: movd %xmm0, %ecx
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; X64-NEXT: xorl %edx, %edx
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; X64-NEXT: movl %ecx, %esi
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; X64-NEXT: imull %edx, %esi
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; X64-NEXT: xorl %edi, %edi
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; X64-NEXT: testl %esi, %esi
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; X64-NEXT: setns %dil
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; X64-NEXT: addl $2147483647, %edi # imm = 0x7FFFFFFF
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; X64-NEXT: imull %edx, %ecx
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; X64-NEXT: cmovol %edi, %ecx
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; X64-NEXT: pshufd {{.*#+}} xmm2 = xmm1[2,3,2,3]
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; X64-NEXT: movd %xmm2, %edx
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; X64-NEXT: pshufd {{.*#+}} xmm2 = xmm0[2,3,2,3]
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; X64-NEXT: movd %xmm2, %esi
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; X64-NEXT: movl %esi, %edi
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; X64-NEXT: imull %edx, %edi
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; X64-NEXT: xorl %eax, %eax
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; X64-NEXT: testl %edi, %edi
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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: imull %edx, %esi
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; X64-NEXT: cmovol %eax, %esi
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; X64-NEXT: pshufd {{.*#+}} xmm1 = xmm1[3,3,3,3]
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; X64-NEXT: movd %xmm1, %r9d
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; X64-NEXT: pshufd {{.*#+}} xmm0 = xmm0[3,3,3,3]
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; X64-NEXT: movd %xmm0, %edx
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; X64-NEXT: movl %edx, %edi
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; X64-NEXT: imull %r9d, %edi
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; X64-NEXT: xorl %eax, %eax
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; X64-NEXT: testl %edi, %edi
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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: imull %r9d, %edx
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; X64-NEXT: cmovol %eax, %edx
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; X64-NEXT: movd %edx, %xmm0
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; X64-NEXT: movd %esi, %xmm1
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; X64-NEXT: punpckldq {{.*#+}} xmm1 = xmm1[0],xmm0[0],xmm1[1],xmm0[1]
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; X64-NEXT: xorl %eax, %esi
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; X64-NEXT: sets %dl
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; X64-NEXT: addl $2147483647, %edx # imm = 0x7FFFFFFF
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; X64-NEXT: imull %eax, %ecx
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; X64-NEXT: cmovol %edx, %ecx
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; X64-NEXT: movd %ecx, %xmm2
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; X64-NEXT: pshufd {{.*#+}} xmm3 = xmm1[2,3,2,3]
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; X64-NEXT: movd %xmm3, %eax
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; X64-NEXT: pshufd {{.*#+}} xmm3 = xmm0[2,3,2,3]
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; X64-NEXT: movd %xmm3, %ecx
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; X64-NEXT: xorl %edx, %edx
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; X64-NEXT: movl %ecx, %esi
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; X64-NEXT: xorl %eax, %esi
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; X64-NEXT: sets %dl
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; X64-NEXT: addl $2147483647, %edx # imm = 0x7FFFFFFF
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; X64-NEXT: imull %eax, %ecx
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; X64-NEXT: cmovol %edx, %ecx
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; X64-NEXT: movd %ecx, %xmm3
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; X64-NEXT: punpckldq {{.*#+}} xmm3 = xmm3[0],xmm2[0],xmm3[1],xmm2[1]
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; X64-NEXT: movd %xmm1, %eax
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; X64-NEXT: movd %xmm0, %ecx
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; X64-NEXT: xorl %edx, %edx
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; X64-NEXT: movl %ecx, %esi
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; X64-NEXT: xorl %eax, %esi
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; X64-NEXT: sets %dl
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; X64-NEXT: addl $2147483647, %edx # imm = 0x7FFFFFFF
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; X64-NEXT: imull %eax, %ecx
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; X64-NEXT: cmovol %edx, %ecx
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; X64-NEXT: movd %ecx, %xmm2
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; X64-NEXT: pshufd {{.*#+}} xmm1 = xmm1[1,1,1,1]
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; X64-NEXT: movd %xmm1, %eax
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; X64-NEXT: pshufd {{.*#+}} xmm0 = xmm0[1,1,1,1]
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; X64-NEXT: movd %xmm0, %ecx
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; X64-NEXT: xorl %edx, %edx
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; X64-NEXT: movl %ecx, %esi
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; X64-NEXT: xorl %eax, %esi
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; X64-NEXT: sets %dl
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; X64-NEXT: addl $2147483647, %edx # imm = 0x7FFFFFFF
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; X64-NEXT: imull %eax, %ecx
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; X64-NEXT: cmovol %edx, %ecx
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; X64-NEXT: movd %ecx, %xmm0
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; X64-NEXT: movd %r8d, %xmm2
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; X64-NEXT: punpckldq {{.*#+}} xmm0 = xmm0[0],xmm2[0],xmm0[1],xmm2[1]
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||||
; X64-NEXT: punpcklqdq {{.*#+}} xmm0 = xmm0[0],xmm1[0]
|
||||
; X64-NEXT: punpckldq {{.*#+}} xmm2 = xmm2[0],xmm0[0],xmm2[1],xmm0[1]
|
||||
; X64-NEXT: punpcklqdq {{.*#+}} xmm2 = xmm2[0],xmm3[0]
|
||||
; X64-NEXT: movdqa %xmm2, %xmm0
|
||||
; X64-NEXT: retq
|
||||
;
|
||||
; X86-LABEL: vec2:
|
||||
@ -515,51 +518,47 @@ define <4 x i32> @vec2(<4 x i32> %x, <4 x i32> %y) nounwind {
|
||||
; X86-NEXT: pushl %ebx
|
||||
; X86-NEXT: pushl %edi
|
||||
; X86-NEXT: pushl %esi
|
||||
; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
|
||||
; X86-NEXT: movl {{[0-9]+}}(%esp), %esi
|
||||
; X86-NEXT: movl {{[0-9]+}}(%esp), %ebp
|
||||
; X86-NEXT: movl {{[0-9]+}}(%esp), %edi
|
||||
; X86-NEXT: movl {{[0-9]+}}(%esp), %ecx
|
||||
; X86-NEXT: movl {{[0-9]+}}(%esp), %edx
|
||||
; X86-NEXT: movl %ecx, %esi
|
||||
; X86-NEXT: imull %edx, %esi
|
||||
; X86-NEXT: xorl %eax, %eax
|
||||
; X86-NEXT: testl %esi, %esi
|
||||
; X86-NEXT: setns %al
|
||||
; X86-NEXT: addl $2147483647, %eax # imm = 0x7FFFFFFF
|
||||
; X86-NEXT: imull %edx, %ecx
|
||||
; X86-NEXT: movl {{[0-9]+}}(%esp), %edx
|
||||
; X86-NEXT: cmovol %eax, %ecx
|
||||
; X86-NEXT: movl {{[0-9]+}}(%esp), %esi
|
||||
; X86-NEXT: movl %edx, %edi
|
||||
; X86-NEXT: imull %esi, %edi
|
||||
; X86-NEXT: xorl %eax, %eax
|
||||
; X86-NEXT: testl %edi, %edi
|
||||
; X86-NEXT: setns %al
|
||||
; X86-NEXT: addl $2147483647, %eax # imm = 0x7FFFFFFF
|
||||
; X86-NEXT: imull %esi, %edx
|
||||
; X86-NEXT: movl {{[0-9]+}}(%esp), %esi
|
||||
; X86-NEXT: cmovol %eax, %edx
|
||||
; X86-NEXT: movl {{[0-9]+}}(%esp), %edi
|
||||
; X86-NEXT: movl %esi, %ebx
|
||||
; X86-NEXT: imull %edi, %ebx
|
||||
; X86-NEXT: xorl %eax, %eax
|
||||
; X86-NEXT: testl %ebx, %ebx
|
||||
; X86-NEXT: setns %al
|
||||
; X86-NEXT: addl $2147483647, %eax # imm = 0x7FFFFFFF
|
||||
; X86-NEXT: imull %edi, %esi
|
||||
; X86-NEXT: movl {{[0-9]+}}(%esp), %edi
|
||||
; X86-NEXT: cmovol %eax, %esi
|
||||
; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
|
||||
; X86-NEXT: movl %edi, %ebp
|
||||
; X86-NEXT: imull %eax, %ebp
|
||||
; X86-NEXT: xorl %ebx, %ebx
|
||||
; X86-NEXT: testl %ebp, %ebp
|
||||
; X86-NEXT: setns %bl
|
||||
; X86-NEXT: movl %ecx, %edx
|
||||
; X86-NEXT: xorl %edi, %edx
|
||||
; X86-NEXT: movl {{[0-9]+}}(%esp), %edx
|
||||
; X86-NEXT: sets %bl
|
||||
; X86-NEXT: addl $2147483647, %ebx # imm = 0x7FFFFFFF
|
||||
; X86-NEXT: imull %eax, %edi
|
||||
; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
|
||||
; X86-NEXT: imull %edi, %ecx
|
||||
; X86-NEXT: cmovol %ebx, %ecx
|
||||
; X86-NEXT: xorl %ebx, %ebx
|
||||
; X86-NEXT: movl %edx, %edi
|
||||
; X86-NEXT: xorl %ebp, %edi
|
||||
; X86-NEXT: movl {{[0-9]+}}(%esp), %edi
|
||||
; X86-NEXT: sets %bl
|
||||
; X86-NEXT: addl $2147483647, %ebx # imm = 0x7FFFFFFF
|
||||
; X86-NEXT: imull %ebp, %edx
|
||||
; X86-NEXT: cmovol %ebx, %edx
|
||||
; X86-NEXT: xorl %ebx, %ebx
|
||||
; X86-NEXT: movl %edi, %ebp
|
||||
; X86-NEXT: xorl %esi, %ebp
|
||||
; X86-NEXT: movl {{[0-9]+}}(%esp), %ebp
|
||||
; X86-NEXT: sets %bl
|
||||
; X86-NEXT: addl $2147483647, %ebx # imm = 0x7FFFFFFF
|
||||
; X86-NEXT: imull %esi, %edi
|
||||
; X86-NEXT: cmovol %ebx, %edi
|
||||
; X86-NEXT: movl %ecx, 12(%eax)
|
||||
; X86-NEXT: movl %edx, 8(%eax)
|
||||
; X86-NEXT: movl %esi, 4(%eax)
|
||||
; X86-NEXT: movl %edi, (%eax)
|
||||
; X86-NEXT: xorl %ebx, %ebx
|
||||
; X86-NEXT: movl %ebp, %esi
|
||||
; X86-NEXT: xorl %eax, %esi
|
||||
; X86-NEXT: sets %bl
|
||||
; X86-NEXT: addl $2147483647, %ebx # imm = 0x7FFFFFFF
|
||||
; X86-NEXT: imull %eax, %ebp
|
||||
; X86-NEXT: cmovol %ebx, %ebp
|
||||
; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
|
||||
; X86-NEXT: movl %ebp, 12(%eax)
|
||||
; X86-NEXT: movl %edi, 8(%eax)
|
||||
; X86-NEXT: movl %edx, 4(%eax)
|
||||
; X86-NEXT: movl %ecx, (%eax)
|
||||
; X86-NEXT: popl %esi
|
||||
; X86-NEXT: popl %edi
|
||||
; X86-NEXT: popl %ebx
|
||||
|
||||
@ -32,13 +32,8 @@ define i64 @func2() nounwind {
|
||||
; X64: # %bb.0:
|
||||
; X64-NEXT: movl $3, %eax
|
||||
; X64-NEXT: imulq $2, %rax, %rcx
|
||||
; X64-NEXT: xorl %edx, %edx
|
||||
; X64-NEXT: testq %rcx, %rcx
|
||||
; X64-NEXT: setns %dl
|
||||
; X64-NEXT: movabsq $9223372036854775807, %rcx # imm = 0x7FFFFFFFFFFFFFFF
|
||||
; X64-NEXT: addq %rdx, %rcx
|
||||
; X64-NEXT: imulq $2, %rax, %rax
|
||||
; X64-NEXT: cmovoq %rcx, %rax
|
||||
; X64-NEXT: movabsq $9223372036854775807, %rax # imm = 0x7FFFFFFFFFFFFFFF
|
||||
; X64-NEXT: cmovnoq %rcx, %rax
|
||||
; X64-NEXT: retq
|
||||
%tmp = call i64 @llvm.smul.fix.sat.i64(i64 3, i64 2, i32 0)
|
||||
ret i64 %tmp
|
||||
|
||||
Loading…
Reference in New Issue
Block a user