[llvm] 84e9194 - Revert "[X86][MC] Always emit `rep` prefix for `bsf`"
Craig Topper via llvm-commits
llvm-commits at lists.llvm.org
Wed Aug 3 14:51:54 PDT 2022
Author: Craig Topper
Date: 2022-08-03T14:51:34-07:00
New Revision: 84e91948289cd606a0cd8a3372398b363d4b5460
URL: https://github.com/llvm/llvm-project/commit/84e91948289cd606a0cd8a3372398b363d4b5460
DIFF: https://github.com/llvm/llvm-project/commit/84e91948289cd606a0cd8a3372398b363d4b5460.diff
LOG: Revert "[X86][MC] Always emit `rep` prefix for `bsf`"
This reverts commit c2066d19cda20d0e98b95da1493e6c3f26fd9618.
It's causing failures on the build bots.
Added:
Modified:
llvm/lib/Target/X86/X86MCInstLower.cpp
llvm/test/CodeGen/X86/clz.ll
llvm/test/CodeGen/X86/dagcombine-select.ll
llvm/test/CodeGen/X86/peephole-na-phys-copy-folding.ll
llvm/test/CodeGen/X86/stack-folding-x86_64.ll
Removed:
################################################################################
diff --git a/llvm/lib/Target/X86/X86MCInstLower.cpp b/llvm/lib/Target/X86/X86MCInstLower.cpp
index 4c33646e593a1..0972e80ddb088 100644
--- a/llvm/lib/Target/X86/X86MCInstLower.cpp
+++ b/llvm/lib/Target/X86/X86MCInstLower.cpp
@@ -982,10 +982,6 @@ void X86MCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
X86II::isX86_64ExtendedReg(OutMI.getOperand(2).getReg()))
std::swap(OutMI.getOperand(1), OutMI.getOperand(2));
}
- // Add an REP prefix to BSF instructions so that new processors can
- // recognize as TZCNT, which has better performance than BSF.
- if (X86::isBSF(OutMI.getOpcode()) && !MF.getFunction().hasOptSize())
- OutMI.setFlags(X86::IP_HAS_REPEAT);
break;
}
}
diff --git a/llvm/test/CodeGen/X86/clz.ll b/llvm/test/CodeGen/X86/clz.ll
index ff5bfc9b48979..0a9f276fcc768 100644
--- a/llvm/test/CodeGen/X86/clz.ll
+++ b/llvm/test/CodeGen/X86/clz.ll
@@ -18,13 +18,13 @@ declare i64 @llvm.ctlz.i64(i64, i1)
define i8 @cttz_i8(i8 %x) {
; X86-LABEL: cttz_i8:
; X86: # %bb.0:
-; X86-NEXT: rep bsfl {{[0-9]+}}(%esp), %eax
+; X86-NEXT: bsfl {{[0-9]+}}(%esp), %eax
; X86-NEXT: # kill: def $al killed $al killed $eax
; X86-NEXT: retl
;
; X64-LABEL: cttz_i8:
; X64: # %bb.0:
-; X64-NEXT: rep bsfl %edi, %eax
+; X64-NEXT: bsfl %edi, %eax
; X64-NEXT: # kill: def $al killed $al killed $eax
; X64-NEXT: retq
;
@@ -46,13 +46,13 @@ define i8 @cttz_i8(i8 %x) {
define i16 @cttz_i16(i16 %x) {
; X86-LABEL: cttz_i16:
; X86: # %bb.0:
-; X86-NEXT: rep bsfl {{[0-9]+}}(%esp), %eax
+; X86-NEXT: bsfl {{[0-9]+}}(%esp), %eax
; X86-NEXT: # kill: def $ax killed $ax killed $eax
; X86-NEXT: retl
;
; X64-LABEL: cttz_i16:
; X64: # %bb.0:
-; X64-NEXT: rep bsfl %edi, %eax
+; X64-NEXT: bsfl %edi, %eax
; X64-NEXT: # kill: def $ax killed $ax killed $eax
; X64-NEXT: retq
;
@@ -74,12 +74,12 @@ define i16 @cttz_i16(i16 %x) {
define i32 @cttz_i32(i32 %x) {
; X86-LABEL: cttz_i32:
; X86: # %bb.0:
-; X86-NEXT: rep bsfl {{[0-9]+}}(%esp), %eax
+; X86-NEXT: bsfl {{[0-9]+}}(%esp), %eax
; X86-NEXT: retl
;
; X64-LABEL: cttz_i32:
; X64: # %bb.0:
-; X64-NEXT: rep bsfl %edi, %eax
+; X64-NEXT: bsfl %edi, %eax
; X64-NEXT: retq
;
; X86-CLZ-LABEL: cttz_i32:
@@ -102,20 +102,20 @@ define i64 @cttz_i64(i64 %x) {
; X86-NOCMOV-NEXT: testl %eax, %eax
; X86-NOCMOV-NEXT: jne .LBB3_1
; X86-NOCMOV-NEXT: # %bb.2:
-; X86-NOCMOV-NEXT: rep bsfl {{[0-9]+}}(%esp), %eax
+; X86-NOCMOV-NEXT: bsfl {{[0-9]+}}(%esp), %eax
; X86-NOCMOV-NEXT: addl $32, %eax
; X86-NOCMOV-NEXT: xorl %edx, %edx
; X86-NOCMOV-NEXT: retl
; X86-NOCMOV-NEXT: .LBB3_1:
-; X86-NOCMOV-NEXT: rep bsfl %eax, %eax
+; X86-NOCMOV-NEXT: bsfl %eax, %eax
; X86-NOCMOV-NEXT: xorl %edx, %edx
; X86-NOCMOV-NEXT: retl
;
; X86-CMOV-LABEL: cttz_i64:
; X86-CMOV: # %bb.0:
; X86-CMOV-NEXT: movl {{[0-9]+}}(%esp), %ecx
-; X86-CMOV-NEXT: rep bsfl %ecx, %edx
-; X86-CMOV-NEXT: rep bsfl {{[0-9]+}}(%esp), %eax
+; X86-CMOV-NEXT: bsfl %ecx, %edx
+; X86-CMOV-NEXT: bsfl {{[0-9]+}}(%esp), %eax
; X86-CMOV-NEXT: addl $32, %eax
; X86-CMOV-NEXT: testl %ecx, %ecx
; X86-CMOV-NEXT: cmovnel %edx, %eax
@@ -124,7 +124,7 @@ define i64 @cttz_i64(i64 %x) {
;
; X64-LABEL: cttz_i64:
; X64: # %bb.0:
-; X64-NEXT: rep bsfq %rdi, %rax
+; X64-NEXT: bsfq %rdi, %rax
; X64-NEXT: retq
;
; X86-CLZ-LABEL: cttz_i64:
@@ -519,7 +519,7 @@ define i8 @cttz_i8_zero_test(i8 %n) {
; X86-NEXT: je .LBB12_1
; X86-NEXT: # %bb.2: # %cond.false
; X86-NEXT: movzbl %al, %eax
-; X86-NEXT: rep bsfl %eax, %eax
+; X86-NEXT: bsfl %eax, %eax
; X86-NEXT: # kill: def $al killed $al killed $eax
; X86-NEXT: retl
; X86-NEXT: .LBB12_1:
@@ -533,7 +533,7 @@ define i8 @cttz_i8_zero_test(i8 %n) {
; X64-NEXT: je .LBB12_1
; X64-NEXT: # %bb.2: # %cond.false
; X64-NEXT: movzbl %dil, %eax
-; X64-NEXT: rep bsfl %eax, %eax
+; X64-NEXT: bsfl %eax, %eax
; X64-NEXT: # kill: def $al killed $al killed $eax
; X64-NEXT: retq
; X64-NEXT: .LBB12_1:
@@ -567,7 +567,7 @@ define i16 @cttz_i16_zero_test(i16 %n) {
; X86-NEXT: testw %ax, %ax
; X86-NEXT: je .LBB13_1
; X86-NEXT: # %bb.2: # %cond.false
-; X86-NEXT: rep bsfl %eax, %eax
+; X86-NEXT: bsfl %eax, %eax
; X86-NEXT: # kill: def $ax killed $ax killed $eax
; X86-NEXT: retl
; X86-NEXT: .LBB13_1:
@@ -580,7 +580,7 @@ define i16 @cttz_i16_zero_test(i16 %n) {
; X64-NEXT: testw %di, %di
; X64-NEXT: je .LBB13_1
; X64-NEXT: # %bb.2: # %cond.false
-; X64-NEXT: rep bsfl %edi, %eax
+; X64-NEXT: bsfl %edi, %eax
; X64-NEXT: # kill: def $ax killed $ax killed $eax
; X64-NEXT: retq
; X64-NEXT: .LBB13_1:
@@ -614,7 +614,7 @@ define i32 @cttz_i32_zero_test(i32 %n) {
; X86-NEXT: testl %eax, %eax
; X86-NEXT: je .LBB14_1
; X86-NEXT: # %bb.2: # %cond.false
-; X86-NEXT: rep bsfl %eax, %eax
+; X86-NEXT: bsfl %eax, %eax
; X86-NEXT: retl
; X86-NEXT: .LBB14_1:
; X86-NEXT: movl $32, %eax
@@ -625,7 +625,7 @@ define i32 @cttz_i32_zero_test(i32 %n) {
; X64-NEXT: testl %edi, %edi
; X64-NEXT: je .LBB14_1
; X64-NEXT: # %bb.2: # %cond.false
-; X64-NEXT: rep bsfl %edi, %eax
+; X64-NEXT: bsfl %edi, %eax
; X64-NEXT: retq
; X64-NEXT: .LBB14_1:
; X64-NEXT: movl $32, %eax
@@ -649,7 +649,7 @@ define i64 @cttz_i64_zero_test(i64 %n) {
; X86-NOCMOV-LABEL: cttz_i64_zero_test:
; X86-NOCMOV: # %bb.0:
; X86-NOCMOV-NEXT: movl {{[0-9]+}}(%esp), %ecx
-; X86-NOCMOV-NEXT: rep bsfl {{[0-9]+}}(%esp), %edx
+; X86-NOCMOV-NEXT: bsfl {{[0-9]+}}(%esp), %edx
; X86-NOCMOV-NEXT: movl $32, %eax
; X86-NOCMOV-NEXT: je .LBB15_2
; X86-NOCMOV-NEXT: # %bb.1:
@@ -662,18 +662,18 @@ define i64 @cttz_i64_zero_test(i64 %n) {
; X86-NOCMOV-NEXT: xorl %edx, %edx
; X86-NOCMOV-NEXT: retl
; X86-NOCMOV-NEXT: .LBB15_3:
-; X86-NOCMOV-NEXT: rep bsfl %ecx, %eax
+; X86-NOCMOV-NEXT: bsfl %ecx, %eax
; X86-NOCMOV-NEXT: xorl %edx, %edx
; X86-NOCMOV-NEXT: retl
;
; X86-CMOV-LABEL: cttz_i64_zero_test:
; X86-CMOV: # %bb.0:
; X86-CMOV-NEXT: movl {{[0-9]+}}(%esp), %eax
-; X86-CMOV-NEXT: rep bsfl {{[0-9]+}}(%esp), %ecx
+; X86-CMOV-NEXT: bsfl {{[0-9]+}}(%esp), %ecx
; X86-CMOV-NEXT: movl $32, %edx
; X86-CMOV-NEXT: cmovnel %ecx, %edx
; X86-CMOV-NEXT: addl $32, %edx
-; X86-CMOV-NEXT: rep bsfl %eax, %eax
+; X86-CMOV-NEXT: bsfl %eax, %eax
; X86-CMOV-NEXT: cmovel %edx, %eax
; X86-CMOV-NEXT: xorl %edx, %edx
; X86-CMOV-NEXT: retl
@@ -683,7 +683,7 @@ define i64 @cttz_i64_zero_test(i64 %n) {
; X64-NEXT: testq %rdi, %rdi
; X64-NEXT: je .LBB15_1
; X64-NEXT: # %bb.2: # %cond.false
-; X64-NEXT: rep bsfq %rdi, %rax
+; X64-NEXT: bsfq %rdi, %rax
; X64-NEXT: retq
; X64-NEXT: .LBB15_1:
; X64-NEXT: movl $64, %eax
@@ -833,7 +833,7 @@ define i8 @cttz_i8_knownbits(i8 %x) {
; X86-NEXT: movzbl {{[0-9]+}}(%esp), %eax
; X86-NEXT: orb $2, %al
; X86-NEXT: movzbl %al, %eax
-; X86-NEXT: rep bsfl %eax, %eax
+; X86-NEXT: bsfl %eax, %eax
; X86-NEXT: # kill: def $al killed $al killed $eax
; X86-NEXT: retl
;
@@ -841,7 +841,7 @@ define i8 @cttz_i8_knownbits(i8 %x) {
; X64: # %bb.0:
; X64-NEXT: orb $2, %dil
; X64-NEXT: movzbl %dil, %eax
-; X64-NEXT: rep bsfl %eax, %eax
+; X64-NEXT: bsfl %eax, %eax
; X64-NEXT: # kill: def $al killed $al killed $eax
; X64-NEXT: retq
;
@@ -994,12 +994,12 @@ define i64 @cttz_i64_zero_test_knownneverzero(i64 %n) {
; X86-NOCMOV-NEXT: # %bb.2:
; X86-NOCMOV-NEXT: movl $-2147483648, %eax # imm = 0x80000000
; X86-NOCMOV-NEXT: orl {{[0-9]+}}(%esp), %eax
-; X86-NOCMOV-NEXT: rep bsfl %eax, %eax
+; X86-NOCMOV-NEXT: bsfl %eax, %eax
; X86-NOCMOV-NEXT: orl $32, %eax
; X86-NOCMOV-NEXT: xorl %edx, %edx
; X86-NOCMOV-NEXT: retl
; X86-NOCMOV-NEXT: .LBB22_1:
-; X86-NOCMOV-NEXT: rep bsfl %eax, %eax
+; X86-NOCMOV-NEXT: bsfl %eax, %eax
; X86-NOCMOV-NEXT: xorl %edx, %edx
; X86-NOCMOV-NEXT: retl
;
@@ -1008,8 +1008,8 @@ define i64 @cttz_i64_zero_test_knownneverzero(i64 %n) {
; X86-CMOV-NEXT: movl {{[0-9]+}}(%esp), %ecx
; X86-CMOV-NEXT: movl $-2147483648, %eax # imm = 0x80000000
; X86-CMOV-NEXT: orl {{[0-9]+}}(%esp), %eax
-; X86-CMOV-NEXT: rep bsfl %ecx, %edx
-; X86-CMOV-NEXT: rep bsfl %eax, %eax
+; X86-CMOV-NEXT: bsfl %ecx, %edx
+; X86-CMOV-NEXT: bsfl %eax, %eax
; X86-CMOV-NEXT: orl $32, %eax
; X86-CMOV-NEXT: testl %ecx, %ecx
; X86-CMOV-NEXT: cmovnel %edx, %eax
@@ -1020,7 +1020,7 @@ define i64 @cttz_i64_zero_test_knownneverzero(i64 %n) {
; X64: # %bb.0:
; X64-NEXT: movabsq $-9223372036854775808, %rax # imm = 0x8000000000000000
; X64-NEXT: orq %rdi, %rax
-; X64-NEXT: rep bsfq %rax, %rax
+; X64-NEXT: bsfq %rax, %rax
; X64-NEXT: retq
;
; X86-CLZ-LABEL: cttz_i64_zero_test_knownneverzero:
@@ -1121,55 +1121,3 @@ define i32 @PR47603_zext(i32 %a0, ptr %a1) {
%sext = sext i8 %load to i32
ret i32 %sext
}
-
-define i32 @cttz_i32_osize(i32 %x) optsize {
-; X86-LABEL: cttz_i32_osize:
-; X86: # %bb.0:
-; X86-NOT: rep
-; X86-NEXT: bsfl {{[0-9]+}}(%esp), %eax
-; X86-NEXT: retl
-;
-; X64-LABEL: cttz_i32_osize:
-; X64: # %bb.0:
-; X64-NOT: rep
-; X64-NEXT: bsfl %edi, %eax
-; X64-NEXT: retq
-;
-; X86-CLZ-LABEL: cttz_i32_osize:
-; X86-CLZ: # %bb.0:
-; X86-CLZ-NEXT: tzcntl {{[0-9]+}}(%esp), %eax
-; X86-CLZ-NEXT: retl
-;
-; X64-CLZ-LABEL: cttz_i32_osize:
-; X64-CLZ: # %bb.0:
-; X64-CLZ-NEXT: tzcntl %edi, %eax
-; X64-CLZ-NEXT: retq
- %tmp = call i32 @llvm.cttz.i32( i32 %x, i1 true )
- ret i32 %tmp
-}
-
-define i32 @cttz_i32_msize(i32 %x) minsize {
-; X86-LABEL: cttz_i32_msize:
-; X86: # %bb.0:
-; X86-NOT: rep
-; X86-NEXT: bsfl {{[0-9]+}}(%esp), %eax
-; X86-NEXT: retl
-;
-; X64-LABEL: cttz_i32_msize:
-; X64: # %bb.0:
-; X64-NOT: rep
-; X64-NEXT: bsfl %edi, %eax
-; X64-NEXT: retq
-;
-; X86-CLZ-LABEL: cttz_i32_msize:
-; X86-CLZ: # %bb.0:
-; X86-CLZ-NEXT: tzcntl {{[0-9]+}}(%esp), %eax
-; X86-CLZ-NEXT: retl
-;
-; X64-CLZ-LABEL: cttz_i32_msize:
-; X64-CLZ: # %bb.0:
-; X64-CLZ-NEXT: tzcntl %edi, %eax
-; X64-CLZ-NEXT: retq
- %tmp = call i32 @llvm.cttz.i32( i32 %x, i1 true )
- ret i32 %tmp
-}
diff --git a/llvm/test/CodeGen/X86/dagcombine-select.ll b/llvm/test/CodeGen/X86/dagcombine-select.ll
index dbd9a2c4e2fe1..9bebec6f5ecdc 100644
--- a/llvm/test/CodeGen/X86/dagcombine-select.ll
+++ b/llvm/test/CodeGen/X86/dagcombine-select.ll
@@ -281,7 +281,7 @@ declare i64 @llvm.cttz.i64(i64, i1)
define i64 @cttz_64_eq_select(i64 %v) nounwind {
; NOBMI-LABEL: cttz_64_eq_select:
; NOBMI: # %bb.0:
-; NOBMI-NEXT: rep bsfq %rdi, %rcx
+; NOBMI-NEXT: bsfq %rdi, %rcx
; NOBMI-NEXT: movq $-1, %rax
; NOBMI-NEXT: cmovneq %rcx, %rax
; NOBMI-NEXT: addq $6, %rax
@@ -305,7 +305,7 @@ define i64 @cttz_64_eq_select(i64 %v) nounwind {
define i64 @cttz_64_ne_select(i64 %v) nounwind {
; NOBMI-LABEL: cttz_64_ne_select:
; NOBMI: # %bb.0:
-; NOBMI-NEXT: rep bsfq %rdi, %rcx
+; NOBMI-NEXT: bsfq %rdi, %rcx
; NOBMI-NEXT: movq $-1, %rax
; NOBMI-NEXT: cmovneq %rcx, %rax
; NOBMI-NEXT: addq $6, %rax
@@ -330,7 +330,7 @@ declare i32 @llvm.cttz.i32(i32, i1)
define i32 @cttz_32_eq_select(i32 %v) nounwind {
; NOBMI-LABEL: cttz_32_eq_select:
; NOBMI: # %bb.0:
-; NOBMI-NEXT: rep bsfl %edi, %ecx
+; NOBMI-NEXT: bsfl %edi, %ecx
; NOBMI-NEXT: movl $-1, %eax
; NOBMI-NEXT: cmovnel %ecx, %eax
; NOBMI-NEXT: addl $6, %eax
@@ -354,7 +354,7 @@ define i32 @cttz_32_eq_select(i32 %v) nounwind {
define i32 @cttz_32_ne_select(i32 %v) nounwind {
; NOBMI-LABEL: cttz_32_ne_select:
; NOBMI: # %bb.0:
-; NOBMI-NEXT: rep bsfl %edi, %ecx
+; NOBMI-NEXT: bsfl %edi, %ecx
; NOBMI-NEXT: movl $-1, %eax
; NOBMI-NEXT: cmovnel %ecx, %eax
; NOBMI-NEXT: addl $6, %eax
@@ -379,7 +379,7 @@ define i32 @cttz_32_ne_select(i32 %v) nounwind {
define i32 @cttz_32_eq_select_ffs(i32 %v) nounwind {
; NOBMI-LABEL: cttz_32_eq_select_ffs:
; NOBMI: # %bb.0:
-; NOBMI-NEXT: rep bsfl %edi, %ecx
+; NOBMI-NEXT: bsfl %edi, %ecx
; NOBMI-NEXT: movl $-1, %eax
; NOBMI-NEXT: cmovnel %ecx, %eax
; NOBMI-NEXT: incl %eax
@@ -403,7 +403,7 @@ define i32 @cttz_32_eq_select_ffs(i32 %v) nounwind {
define i32 @cttz_32_ne_select_ffs(i32 %v) nounwind {
; NOBMI-LABEL: cttz_32_ne_select_ffs:
; NOBMI: # %bb.0:
-; NOBMI-NEXT: rep bsfl %edi, %ecx
+; NOBMI-NEXT: bsfl %edi, %ecx
; NOBMI-NEXT: movl $-1, %eax
; NOBMI-NEXT: cmovnel %ecx, %eax
; NOBMI-NEXT: incl %eax
@@ -428,7 +428,7 @@ define i32 @cttz_32_ne_select_ffs(i32 %v) nounwind {
define i32 @cttz_32_eq_select_ffs_m1(i32 %v) nounwind {
; NOBMI-LABEL: cttz_32_eq_select_ffs_m1:
; NOBMI: # %bb.0:
-; NOBMI-NEXT: rep bsfl %edi, %ecx
+; NOBMI-NEXT: bsfl %edi, %ecx
; NOBMI-NEXT: movl $-1, %eax
; NOBMI-NEXT: cmovnel %ecx, %eax
; NOBMI-NEXT: retq
@@ -449,7 +449,7 @@ define i32 @cttz_32_eq_select_ffs_m1(i32 %v) nounwind {
define i32 @cttz_32_ne_select_ffs_m1(i32 %v) nounwind {
; NOBMI-LABEL: cttz_32_ne_select_ffs_m1:
; NOBMI: # %bb.0:
-; NOBMI-NEXT: rep bsfl %edi, %ecx
+; NOBMI-NEXT: bsfl %edi, %ecx
; NOBMI-NEXT: movl $-1, %eax
; NOBMI-NEXT: cmovnel %ecx, %eax
; NOBMI-NEXT: retq
diff --git a/llvm/test/CodeGen/X86/peephole-na-phys-copy-folding.ll b/llvm/test/CodeGen/X86/peephole-na-phys-copy-folding.ll
index 9069688c8037c..f3d4b6221d085 100644
--- a/llvm/test/CodeGen/X86/peephole-na-phys-copy-folding.ll
+++ b/llvm/test/CodeGen/X86/peephole-na-phys-copy-folding.ll
@@ -353,7 +353,6 @@ define i1 @asm_clobbering_flags(ptr %mem) nounwind {
; CHECK32-NEXT: testl %edx, %edx
; CHECK32-NEXT: setg %al
; CHECK32-NEXT: #APP
-; CHECK32-NOT: rep
; CHECK32-NEXT: bsfl %edx, %edx
; CHECK32-NEXT: #NO_APP
; CHECK32-NEXT: movl %edx, (%ecx)
@@ -365,7 +364,6 @@ define i1 @asm_clobbering_flags(ptr %mem) nounwind {
; CHECK64-NEXT: testl %ecx, %ecx
; CHECK64-NEXT: setg %al
; CHECK64-NEXT: #APP
-; CHECK64-NOT: rep
; CHECK64-NEXT: bsfl %ecx, %ecx
; CHECK64-NEXT: #NO_APP
; CHECK64-NEXT: movl %ecx, (%rdi)
diff --git a/llvm/test/CodeGen/X86/stack-folding-x86_64.ll b/llvm/test/CodeGen/X86/stack-folding-x86_64.ll
index c505f4ba8f77c..e6fbec1ace3d0 100644
--- a/llvm/test/CodeGen/X86/stack-folding-x86_64.ll
+++ b/llvm/test/CodeGen/X86/stack-folding-x86_64.ll
@@ -37,7 +37,7 @@ define i32 @stack_fold_bsf_i32(i32 %a0) {
; CHECK-NEXT: #APP
; CHECK-NEXT: nop
; CHECK-NEXT: #NO_APP
-; CHECK-NEXT: rep bsfl {{[-0-9]+}}(%r{{[sb]}}p), %eax # 4-byte Folded Reload
+; CHECK-NEXT: bsfl {{[-0-9]+}}(%r{{[sb]}}p), %eax # 4-byte Folded Reload
; CHECK-NEXT: popq %rbx
; CHECK-NEXT: .cfi_def_cfa_offset 48
; CHECK-NEXT: popq %r12
@@ -82,7 +82,7 @@ define i64 @stack_fold_bsf_i64(i64 %a0) {
; CHECK-NEXT: #APP
; CHECK-NEXT: nop
; CHECK-NEXT: #NO_APP
-; CHECK-NEXT: rep bsfq {{[-0-9]+}}(%r{{[sb]}}p), %rax # 8-byte Folded Reload
+; CHECK-NEXT: bsfq {{[-0-9]+}}(%r{{[sb]}}p), %rax # 8-byte Folded Reload
; CHECK-NEXT: popq %rbx
; CHECK-NEXT: .cfi_def_cfa_offset 48
; CHECK-NEXT: popq %r12
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