; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 3 ; RUN: llc < %s -mtriple=x86_64-unknown | FileCheck %s ; When optimize for size, the constant $858993459 is moved into a register, ; and use that register in following two andl instructions. define i32 @cnt32_optsize(i32 %x) nounwind readnone optsize { ; CHECK-LABEL: cnt32_optsize: ; CHECK: # %bb.0: ; CHECK-NEXT: movl %edi, %eax ; CHECK-NEXT: shrl %eax ; CHECK-NEXT: andl $1431655765, %eax # imm = 0x55555555 ; CHECK-NEXT: subl %eax, %edi ; CHECK-NEXT: movl $858993459, %eax # imm = 0x33333333 ; CHECK-NEXT: movl %edi, %ecx ; CHECK-NEXT: andl %eax, %ecx ; CHECK-NEXT: shrl $2, %edi ; CHECK-NEXT: andl %eax, %edi ; CHECK-NEXT: addl %ecx, %edi ; CHECK-NEXT: movl %edi, %eax ; CHECK-NEXT: shrl $4, %eax ; CHECK-NEXT: addl %edi, %eax ; CHECK-NEXT: andl $252645135, %eax # imm = 0xF0F0F0F ; CHECK-NEXT: imull $16843009, %eax, %eax # imm = 0x1010101 ; CHECK-NEXT: shrl $24, %eax ; CHECK-NEXT: retq %cnt = tail call i32 @llvm.ctpop.i32(i32 %x) ret i32 %cnt } ; When optimize for speed, the constant $858993459 can be directly folded into ; two andl instructions. define i32 @cnt32_optspeed(i32 %x) nounwind readnone { ; CHECK-LABEL: cnt32_optspeed: ; CHECK: # %bb.0: ; CHECK-NEXT: movl %edi, %eax ; CHECK-NEXT: shrl %eax ; CHECK-NEXT: andl $1431655765, %eax # imm = 0x55555555 ; CHECK-NEXT: subl %eax, %edi ; CHECK-NEXT: movl %edi, %eax ; CHECK-NEXT: andl $858993459, %eax # imm = 0x33333333 ; CHECK-NEXT: shrl $2, %edi ; CHECK-NEXT: andl $858993459, %edi # imm = 0x33333333 ; CHECK-NEXT: addl %eax, %edi ; CHECK-NEXT: movl %edi, %eax ; CHECK-NEXT: shrl $4, %eax ; CHECK-NEXT: addl %edi, %eax ; CHECK-NEXT: andl $252645135, %eax # imm = 0xF0F0F0F ; CHECK-NEXT: imull $16843009, %eax, %eax # imm = 0x1010101 ; CHECK-NEXT: shrl $24, %eax ; CHECK-NEXT: retq %cnt = tail call i32 @llvm.ctpop.i32(i32 %x) ret i32 %cnt } declare i32 @llvm.ctpop.i32(i32) nounwind readnone