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llvm-project/llvm/test/CodeGen/X86/ctlo.ll
Sergei Barannikov becd418626
[CGP] Despeculate ctlz/cttz with "illegal" integer types (#137197) 
The code below the removed check looks generic enough to support
arbitrary integer widths. This change helps 32-bit targets avoid
expensive expansion/libcalls in the case of zero input.

Pull Request: https://github.com/llvm/llvm-project/pull/137197
2025-04-29 22:33:40 +03:00

444 lines
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LLVM
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -mtriple=i686-unknown-unknown | FileCheck %s --check-prefixes=X86,X86-NOCMOV
; RUN: llc < %s -mtriple=i686-unknown-unknown -mattr=+cmov | FileCheck %s --check-prefixes=X86,X86-CMOV
; RUN: llc < %s -mtriple=x86_64-unknown-unknown | FileCheck %s --check-prefix=X64
; RUN: llc < %s -mtriple=i686-unknown-unknown -mattr=+bmi,+lzcnt | FileCheck %s --check-prefix=X86-CLZ
; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=+bmi,+lzcnt | FileCheck %s --check-prefix=X64-CLZ
; RUN: llc < %s -mtriple=i686-unknown-unknown -mattr=+bmi,+lzcnt,+fast-lzcnt | FileCheck %s --check-prefix=X86-CLZ
; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=+bmi,+lzcnt,+fast-lzcnt | FileCheck %s --check-prefix=X64-CLZ
declare i8 @llvm.ctlz.i8(i8, i1)
declare i16 @llvm.ctlz.i16(i16, i1)
declare i32 @llvm.ctlz.i32(i32, i1)
declare i64 @llvm.ctlz.i64(i64, i1)
define i8 @ctlo_i8(i8 %x) {
; X86-NOCMOV-LABEL: ctlo_i8:
; X86-NOCMOV: # %bb.0:
; X86-NOCMOV-NEXT: movzbl {{[0-9]+}}(%esp), %eax
; X86-NOCMOV-NEXT: xorb $-1, %al
; X86-NOCMOV-NEXT: je .LBB0_1
; X86-NOCMOV-NEXT: # %bb.2: # %cond.false
; X86-NOCMOV-NEXT: movzbl %al, %eax
; X86-NOCMOV-NEXT: bsrl %eax, %eax
; X86-NOCMOV-NEXT: xorl $7, %eax
; X86-NOCMOV-NEXT: # kill: def $al killed $al killed $eax
; X86-NOCMOV-NEXT: retl
; X86-NOCMOV-NEXT: .LBB0_1:
; X86-NOCMOV-NEXT: movb $8, %al
; X86-NOCMOV-NEXT: # kill: def $al killed $al killed $eax
; X86-NOCMOV-NEXT: retl
;
; X86-CMOV-LABEL: ctlo_i8:
; X86-CMOV: # %bb.0:
; X86-CMOV-NEXT: movzbl {{[0-9]+}}(%esp), %eax
; X86-CMOV-NEXT: notb %al
; X86-CMOV-NEXT: movzbl %al, %eax
; X86-CMOV-NEXT: bsrl %eax, %ecx
; X86-CMOV-NEXT: movl $15, %eax
; X86-CMOV-NEXT: cmovnel %ecx, %eax
; X86-CMOV-NEXT: xorl $7, %eax
; X86-CMOV-NEXT: # kill: def $al killed $al killed $eax
; X86-CMOV-NEXT: retl
;
; X64-LABEL: ctlo_i8:
; X64: # %bb.0:
; X64-NEXT: notb %dil
; X64-NEXT: movzbl %dil, %ecx
; X64-NEXT: movl $15, %eax
; X64-NEXT: bsrl %ecx, %eax
; X64-NEXT: xorl $7, %eax
; X64-NEXT: # kill: def $al killed $al killed $eax
; X64-NEXT: retq
;
; X86-CLZ-LABEL: ctlo_i8:
; X86-CLZ: # %bb.0:
; X86-CLZ-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-CLZ-NEXT: shll $24, %eax
; X86-CLZ-NEXT: notl %eax
; X86-CLZ-NEXT: lzcntl %eax, %eax
; X86-CLZ-NEXT: # kill: def $al killed $al killed $eax
; X86-CLZ-NEXT: retl
;
; X64-CLZ-LABEL: ctlo_i8:
; X64-CLZ: # %bb.0:
; X64-CLZ-NEXT: shll $24, %edi
; X64-CLZ-NEXT: notl %edi
; X64-CLZ-NEXT: lzcntl %edi, %eax
; X64-CLZ-NEXT: # kill: def $al killed $al killed $eax
; X64-CLZ-NEXT: retq
%tmp1 = xor i8 %x, -1
%tmp2 = call i8 @llvm.ctlz.i8( i8 %tmp1, i1 false )
ret i8 %tmp2
}
define i8 @ctlo_i8_undef(i8 %x) {
; X86-LABEL: ctlo_i8_undef:
; X86: # %bb.0:
; X86-NEXT: movzbl {{[0-9]+}}(%esp), %eax
; X86-NEXT: notb %al
; X86-NEXT: movzbl %al, %eax
; X86-NEXT: bsrl %eax, %eax
; X86-NEXT: xorl $7, %eax
; X86-NEXT: # kill: def $al killed $al killed $eax
; X86-NEXT: retl
;
; X64-LABEL: ctlo_i8_undef:
; X64: # %bb.0:
; X64-NEXT: notb %dil
; X64-NEXT: movzbl %dil, %eax
; X64-NEXT: bsrl %eax, %eax
; X64-NEXT: xorl $7, %eax
; X64-NEXT: # kill: def $al killed $al killed $eax
; X64-NEXT: retq
;
; X86-CLZ-LABEL: ctlo_i8_undef:
; X86-CLZ: # %bb.0:
; X86-CLZ-NEXT: movzbl {{[0-9]+}}(%esp), %eax
; X86-CLZ-NEXT: notb %al
; X86-CLZ-NEXT: movzbl %al, %eax
; X86-CLZ-NEXT: shll $24, %eax
; X86-CLZ-NEXT: lzcntl %eax, %eax
; X86-CLZ-NEXT: # kill: def $al killed $al killed $eax
; X86-CLZ-NEXT: retl
;
; X64-CLZ-LABEL: ctlo_i8_undef:
; X64-CLZ: # %bb.0:
; X64-CLZ-NEXT: notb %dil
; X64-CLZ-NEXT: movzbl %dil, %eax
; X64-CLZ-NEXT: shll $24, %eax
; X64-CLZ-NEXT: lzcntl %eax, %eax
; X64-CLZ-NEXT: # kill: def $al killed $al killed $eax
; X64-CLZ-NEXT: retq
%tmp1 = xor i8 %x, -1
%tmp2 = call i8 @llvm.ctlz.i8( i8 %tmp1, i1 true )
ret i8 %tmp2
}
define i16 @ctlo_i16(i16 %x) {
; X86-NOCMOV-LABEL: ctlo_i16:
; X86-NOCMOV: # %bb.0:
; X86-NOCMOV-NEXT: movzwl {{[0-9]+}}(%esp), %eax
; X86-NOCMOV-NEXT: xorw $-1, %ax
; X86-NOCMOV-NEXT: je .LBB2_1
; X86-NOCMOV-NEXT: # %bb.2: # %cond.false
; X86-NOCMOV-NEXT: bsrw %ax, %ax
; X86-NOCMOV-NEXT: xorl $15, %eax
; X86-NOCMOV-NEXT: # kill: def $ax killed $ax killed $eax
; X86-NOCMOV-NEXT: retl
; X86-NOCMOV-NEXT: .LBB2_1:
; X86-NOCMOV-NEXT: movw $16, %ax
; X86-NOCMOV-NEXT: # kill: def $ax killed $ax killed $eax
; X86-NOCMOV-NEXT: retl
;
; X86-CMOV-LABEL: ctlo_i16:
; X86-CMOV: # %bb.0:
; X86-CMOV-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-CMOV-NEXT: notl %eax
; X86-CMOV-NEXT: bsrw %ax, %cx
; X86-CMOV-NEXT: movw $31, %ax
; X86-CMOV-NEXT: cmovnew %cx, %ax
; X86-CMOV-NEXT: xorl $15, %eax
; X86-CMOV-NEXT: # kill: def $ax killed $ax killed $eax
; X86-CMOV-NEXT: retl
;
; X64-LABEL: ctlo_i16:
; X64: # %bb.0:
; X64-NEXT: notl %edi
; X64-NEXT: movw $31, %ax
; X64-NEXT: bsrw %di, %ax
; X64-NEXT: xorl $15, %eax
; X64-NEXT: # kill: def $ax killed $ax killed $eax
; X64-NEXT: retq
;
; X86-CLZ-LABEL: ctlo_i16:
; X86-CLZ: # %bb.0:
; X86-CLZ-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-CLZ-NEXT: notl %eax
; X86-CLZ-NEXT: lzcntw %ax, %ax
; X86-CLZ-NEXT: retl
;
; X64-CLZ-LABEL: ctlo_i16:
; X64-CLZ: # %bb.0:
; X64-CLZ-NEXT: notl %edi
; X64-CLZ-NEXT: lzcntw %di, %ax
; X64-CLZ-NEXT: retq
%tmp1 = xor i16 %x, -1
%tmp2 = call i16 @llvm.ctlz.i16( i16 %tmp1, i1 false )
ret i16 %tmp2
}
define i16 @ctlo_i16_undef(i16 %x) {
; X86-LABEL: ctlo_i16_undef:
; X86: # %bb.0:
; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-NEXT: notl %eax
; X86-NEXT: bsrw %ax, %ax
; X86-NEXT: xorl $15, %eax
; X86-NEXT: # kill: def $ax killed $ax killed $eax
; X86-NEXT: retl
;
; X64-LABEL: ctlo_i16_undef:
; X64: # %bb.0:
; X64-NEXT: notl %edi
; X64-NEXT: bsrw %di, %ax
; X64-NEXT: xorl $15, %eax
; X64-NEXT: # kill: def $ax killed $ax killed $eax
; X64-NEXT: retq
;
; X86-CLZ-LABEL: ctlo_i16_undef:
; X86-CLZ: # %bb.0:
; X86-CLZ-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-CLZ-NEXT: notl %eax
; X86-CLZ-NEXT: lzcntw %ax, %ax
; X86-CLZ-NEXT: retl
;
; X64-CLZ-LABEL: ctlo_i16_undef:
; X64-CLZ: # %bb.0:
; X64-CLZ-NEXT: notl %edi
; X64-CLZ-NEXT: lzcntw %di, %ax
; X64-CLZ-NEXT: retq
%tmp1 = xor i16 %x, -1
%tmp2 = call i16 @llvm.ctlz.i16( i16 %tmp1, i1 true )
ret i16 %tmp2
}
define i32 @ctlo_i32(i32 %x) {
; X86-NOCMOV-LABEL: ctlo_i32:
; X86-NOCMOV: # %bb.0:
; X86-NOCMOV-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-NOCMOV-NEXT: xorl $-1, %eax
; X86-NOCMOV-NEXT: je .LBB4_1
; X86-NOCMOV-NEXT: # %bb.2: # %cond.false
; X86-NOCMOV-NEXT: bsrl %eax, %eax
; X86-NOCMOV-NEXT: xorl $31, %eax
; X86-NOCMOV-NEXT: retl
; X86-NOCMOV-NEXT: .LBB4_1:
; X86-NOCMOV-NEXT: movl $32, %eax
; X86-NOCMOV-NEXT: retl
;
; X86-CMOV-LABEL: ctlo_i32:
; X86-CMOV: # %bb.0:
; X86-CMOV-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-CMOV-NEXT: notl %eax
; X86-CMOV-NEXT: bsrl %eax, %ecx
; X86-CMOV-NEXT: movl $63, %eax
; X86-CMOV-NEXT: cmovnel %ecx, %eax
; X86-CMOV-NEXT: xorl $31, %eax
; X86-CMOV-NEXT: retl
;
; X64-LABEL: ctlo_i32:
; X64: # %bb.0:
; X64-NEXT: notl %edi
; X64-NEXT: movl $63, %eax
; X64-NEXT: bsrl %edi, %eax
; X64-NEXT: xorl $31, %eax
; X64-NEXT: retq
;
; X86-CLZ-LABEL: ctlo_i32:
; X86-CLZ: # %bb.0:
; X86-CLZ-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-CLZ-NEXT: notl %eax
; X86-CLZ-NEXT: lzcntl %eax, %eax
; X86-CLZ-NEXT: retl
;
; X64-CLZ-LABEL: ctlo_i32:
; X64-CLZ: # %bb.0:
; X64-CLZ-NEXT: notl %edi
; X64-CLZ-NEXT: lzcntl %edi, %eax
; X64-CLZ-NEXT: retq
%tmp1 = xor i32 %x, -1
%tmp2 = call i32 @llvm.ctlz.i32( i32 %tmp1, i1 false )
ret i32 %tmp2
}
define i32 @ctlo_i32_undef(i32 %x) {
; X86-LABEL: ctlo_i32_undef:
; X86: # %bb.0:
; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-NEXT: notl %eax
; X86-NEXT: bsrl %eax, %eax
; X86-NEXT: xorl $31, %eax
; X86-NEXT: retl
;
; X64-LABEL: ctlo_i32_undef:
; X64: # %bb.0:
; X64-NEXT: notl %edi
; X64-NEXT: bsrl %edi, %eax
; X64-NEXT: xorl $31, %eax
; X64-NEXT: retq
;
; X86-CLZ-LABEL: ctlo_i32_undef:
; X86-CLZ: # %bb.0:
; X86-CLZ-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-CLZ-NEXT: notl %eax
; X86-CLZ-NEXT: lzcntl %eax, %eax
; X86-CLZ-NEXT: retl
;
; X64-CLZ-LABEL: ctlo_i32_undef:
; X64-CLZ: # %bb.0:
; X64-CLZ-NEXT: notl %edi
; X64-CLZ-NEXT: lzcntl %edi, %eax
; X64-CLZ-NEXT: retq
%tmp1 = xor i32 %x, -1
%tmp2 = call i32 @llvm.ctlz.i32( i32 %tmp1, i1 true )
ret i32 %tmp2
}
define i64 @ctlo_i64(i64 %x) nounwind {
; X86-NOCMOV-LABEL: ctlo_i64:
; X86-NOCMOV: # %bb.0:
; X86-NOCMOV-NEXT: pushl %esi
; X86-NOCMOV-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-NOCMOV-NEXT: movl {{[0-9]+}}(%esp), %ecx
; X86-NOCMOV-NEXT: notl %ecx
; X86-NOCMOV-NEXT: notl %eax
; X86-NOCMOV-NEXT: xorl %edx, %edx
; X86-NOCMOV-NEXT: movl %eax, %esi
; X86-NOCMOV-NEXT: orl %ecx, %esi
; X86-NOCMOV-NEXT: je .LBB6_1
; X86-NOCMOV-NEXT: # %bb.2: # %cond.false
; X86-NOCMOV-NEXT: testl %ecx, %ecx
; X86-NOCMOV-NEXT: jne .LBB6_3
; X86-NOCMOV-NEXT: # %bb.4: # %cond.false
; X86-NOCMOV-NEXT: bsrl %eax, %eax
; X86-NOCMOV-NEXT: xorl $31, %eax
; X86-NOCMOV-NEXT: orl $32, %eax
; X86-NOCMOV-NEXT: popl %esi
; X86-NOCMOV-NEXT: retl
; X86-NOCMOV-NEXT: .LBB6_1:
; X86-NOCMOV-NEXT: movl $64, %eax
; X86-NOCMOV-NEXT: popl %esi
; X86-NOCMOV-NEXT: retl
; X86-NOCMOV-NEXT: .LBB6_3:
; X86-NOCMOV-NEXT: bsrl %ecx, %eax
; X86-NOCMOV-NEXT: xorl $31, %eax
; X86-NOCMOV-NEXT: popl %esi
; X86-NOCMOV-NEXT: retl
;
; X86-CMOV-LABEL: ctlo_i64:
; X86-CMOV: # %bb.0:
; X86-CMOV-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-CMOV-NEXT: movl {{[0-9]+}}(%esp), %ecx
; X86-CMOV-NEXT: notl %ecx
; X86-CMOV-NEXT: notl %eax
; X86-CMOV-NEXT: bsrl %eax, %eax
; X86-CMOV-NEXT: movl $63, %edx
; X86-CMOV-NEXT: cmovnel %eax, %edx
; X86-CMOV-NEXT: xorl $31, %edx
; X86-CMOV-NEXT: addl $32, %edx
; X86-CMOV-NEXT: bsrl %ecx, %eax
; X86-CMOV-NEXT: xorl $31, %eax
; X86-CMOV-NEXT: testl %ecx, %ecx
; X86-CMOV-NEXT: cmovel %edx, %eax
; X86-CMOV-NEXT: xorl %edx, %edx
; X86-CMOV-NEXT: retl
;
; X64-LABEL: ctlo_i64:
; X64: # %bb.0:
; X64-NEXT: notq %rdi
; X64-NEXT: movl $127, %eax
; X64-NEXT: bsrq %rdi, %rax
; X64-NEXT: xorq $63, %rax
; X64-NEXT: retq
;
; X86-CLZ-LABEL: ctlo_i64:
; X86-CLZ: # %bb.0:
; X86-CLZ-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-CLZ-NEXT: notl %eax
; X86-CLZ-NEXT: testl %eax, %eax
; X86-CLZ-NEXT: jne .LBB6_1
; X86-CLZ-NEXT: # %bb.2:
; X86-CLZ-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-CLZ-NEXT: notl %eax
; X86-CLZ-NEXT: lzcntl %eax, %eax
; X86-CLZ-NEXT: addl $32, %eax
; X86-CLZ-NEXT: xorl %edx, %edx
; X86-CLZ-NEXT: retl
; X86-CLZ-NEXT: .LBB6_1:
; X86-CLZ-NEXT: lzcntl %eax, %eax
; X86-CLZ-NEXT: xorl %edx, %edx
; X86-CLZ-NEXT: retl
;
; X64-CLZ-LABEL: ctlo_i64:
; X64-CLZ: # %bb.0:
; X64-CLZ-NEXT: notq %rdi
; X64-CLZ-NEXT: lzcntq %rdi, %rax
; X64-CLZ-NEXT: retq
%tmp1 = xor i64 %x, -1
%tmp2 = call i64 @llvm.ctlz.i64( i64 %tmp1, i1 false )
ret i64 %tmp2
}
define i64 @ctlo_i64_undef(i64 %x) {
; X86-NOCMOV-LABEL: ctlo_i64_undef:
; X86-NOCMOV: # %bb.0:
; X86-NOCMOV-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-NOCMOV-NEXT: notl %eax
; X86-NOCMOV-NEXT: testl %eax, %eax
; X86-NOCMOV-NEXT: jne .LBB7_1
; X86-NOCMOV-NEXT: # %bb.2:
; X86-NOCMOV-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-NOCMOV-NEXT: notl %eax
; X86-NOCMOV-NEXT: bsrl %eax, %eax
; X86-NOCMOV-NEXT: xorl $31, %eax
; X86-NOCMOV-NEXT: orl $32, %eax
; X86-NOCMOV-NEXT: xorl %edx, %edx
; X86-NOCMOV-NEXT: retl
; X86-NOCMOV-NEXT: .LBB7_1:
; X86-NOCMOV-NEXT: bsrl %eax, %eax
; X86-NOCMOV-NEXT: xorl $31, %eax
; X86-NOCMOV-NEXT: xorl %edx, %edx
; X86-NOCMOV-NEXT: retl
;
; X86-CMOV-LABEL: ctlo_i64_undef:
; X86-CMOV: # %bb.0:
; X86-CMOV-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-CMOV-NEXT: movl {{[0-9]+}}(%esp), %ecx
; X86-CMOV-NEXT: notl %eax
; X86-CMOV-NEXT: notl %ecx
; X86-CMOV-NEXT: bsrl %ecx, %edx
; X86-CMOV-NEXT: xorl $31, %edx
; X86-CMOV-NEXT: bsrl %eax, %eax
; X86-CMOV-NEXT: xorl $31, %eax
; X86-CMOV-NEXT: orl $32, %eax
; X86-CMOV-NEXT: testl %ecx, %ecx
; X86-CMOV-NEXT: cmovnel %edx, %eax
; X86-CMOV-NEXT: xorl %edx, %edx
; X86-CMOV-NEXT: retl
;
; X64-LABEL: ctlo_i64_undef:
; X64: # %bb.0:
; X64-NEXT: notq %rdi
; X64-NEXT: bsrq %rdi, %rax
; X64-NEXT: xorq $63, %rax
; X64-NEXT: retq
;
; X86-CLZ-LABEL: ctlo_i64_undef:
; X86-CLZ: # %bb.0:
; X86-CLZ-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-CLZ-NEXT: notl %eax
; X86-CLZ-NEXT: testl %eax, %eax
; X86-CLZ-NEXT: jne .LBB7_1
; X86-CLZ-NEXT: # %bb.2:
; X86-CLZ-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-CLZ-NEXT: notl %eax
; X86-CLZ-NEXT: lzcntl %eax, %eax
; X86-CLZ-NEXT: addl $32, %eax
; X86-CLZ-NEXT: xorl %edx, %edx
; X86-CLZ-NEXT: retl
; X86-CLZ-NEXT: .LBB7_1:
; X86-CLZ-NEXT: lzcntl %eax, %eax
; X86-CLZ-NEXT: xorl %edx, %edx
; X86-CLZ-NEXT: retl
;
; X64-CLZ-LABEL: ctlo_i64_undef:
; X64-CLZ: # %bb.0:
; X64-CLZ-NEXT: notq %rdi
; X64-CLZ-NEXT: lzcntq %rdi, %rax
; X64-CLZ-NEXT: retq
%tmp1 = xor i64 %x, -1
%tmp2 = call i64 @llvm.ctlz.i64( i64 %tmp1, i1 true )
ret i64 %tmp2
}
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