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-rw-r--r--test/CodeGen/X86/bitreverse.ll382
1 files changed, 375 insertions, 7 deletions
diff --git a/test/CodeGen/X86/bitreverse.ll b/test/CodeGen/X86/bitreverse.ll
index e3bc8ace38ab5..f1b325a03ebdf 100644
--- a/test/CodeGen/X86/bitreverse.ll
+++ b/test/CodeGen/X86/bitreverse.ll
@@ -1,22 +1,390 @@
-; RUN: llc -march=x86 %s -o - | FileCheck %s
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -mtriple=i686-unknown | FileCheck %s
; These tests just check that the plumbing is in place for @llvm.bitreverse. The
; actual output is massive at the moment as llvm.bitreverse is not yet legal.
declare <2 x i16> @llvm.bitreverse.v2i16(<2 x i16>) readnone
-define <2 x i16> @f(<2 x i16> %a) {
-; CHECK-LABEL: f:
-; CHECK: shll
+define <2 x i16> @test_bitreverse_v2i16(<2 x i16> %a) nounwind {
+; CHECK-LABEL: test_bitreverse_v2i16:
+; CHECK: # BB#0:
+; CHECK-NEXT: pushl %edi
+; CHECK-NEXT: pushl %esi
+; CHECK-NEXT: movzwl {{[0-9]+}}(%esp), %edx
+; CHECK-NEXT: movzwl {{[0-9]+}}(%esp), %eax
+; CHECK-NEXT: movl %eax, %ecx
+; CHECK-NEXT: shll $15, %ecx
+; CHECK-NEXT: movl %eax, %esi
+; CHECK-NEXT: andl $2, %esi
+; CHECK-NEXT: shll $13, %esi
+; CHECK-NEXT: orl %ecx, %esi
+; CHECK-NEXT: movl %eax, %ecx
+; CHECK-NEXT: andl $4, %ecx
+; CHECK-NEXT: shll $11, %ecx
+; CHECK-NEXT: orl %esi, %ecx
+; CHECK-NEXT: movl %eax, %esi
+; CHECK-NEXT: andl $8, %esi
+; CHECK-NEXT: shll $9, %esi
+; CHECK-NEXT: orl %ecx, %esi
+; CHECK-NEXT: movl %eax, %edi
+; CHECK-NEXT: andl $16, %edi
+; CHECK-NEXT: shll $7, %edi
+; CHECK-NEXT: orl %esi, %edi
+; CHECK-NEXT: movl %eax, %ecx
+; CHECK-NEXT: andl $32, %ecx
+; CHECK-NEXT: shll $5, %ecx
+; CHECK-NEXT: orl %edi, %ecx
+; CHECK-NEXT: movl %eax, %esi
+; CHECK-NEXT: andl $64, %esi
+; CHECK-NEXT: shll $3, %esi
+; CHECK-NEXT: leal (%eax,%eax), %edi
+; CHECK-NEXT: andl $256, %edi # imm = 0x100
+; CHECK-NEXT: orl %esi, %edi
+; CHECK-NEXT: movl %eax, %esi
+; CHECK-NEXT: shrl %esi
+; CHECK-NEXT: andl $128, %esi
+; CHECK-NEXT: orl %edi, %esi
+; CHECK-NEXT: movl %eax, %edi
+; CHECK-NEXT: shrl $3, %edi
+; CHECK-NEXT: andl $64, %edi
+; CHECK-NEXT: orl %esi, %edi
+; CHECK-NEXT: movl %eax, %esi
+; CHECK-NEXT: shrl $5, %esi
+; CHECK-NEXT: andl $32, %esi
+; CHECK-NEXT: orl %edi, %esi
+; CHECK-NEXT: movl %eax, %edi
+; CHECK-NEXT: shrl $7, %edi
+; CHECK-NEXT: andl $16, %edi
+; CHECK-NEXT: orl %esi, %edi
+; CHECK-NEXT: movl %eax, %esi
+; CHECK-NEXT: shrl $9, %esi
+; CHECK-NEXT: andl $8, %esi
+; CHECK-NEXT: orl %edi, %esi
+; CHECK-NEXT: movl %eax, %edi
+; CHECK-NEXT: shrl $11, %edi
+; CHECK-NEXT: andl $4, %edi
+; CHECK-NEXT: orl %esi, %edi
+; CHECK-NEXT: movl %eax, %esi
+; CHECK-NEXT: shrl $13, %esi
+; CHECK-NEXT: andl $2, %esi
+; CHECK-NEXT: orl %edi, %esi
+; CHECK-NEXT: shrl $15, %eax
+; CHECK-NEXT: orl %esi, %eax
+; CHECK-NEXT: orl %ecx, %eax
+; CHECK-NEXT: movl %edx, %ecx
+; CHECK-NEXT: shll $15, %ecx
+; CHECK-NEXT: movl %edx, %esi
+; CHECK-NEXT: andl $2, %esi
+; CHECK-NEXT: shll $13, %esi
+; CHECK-NEXT: orl %ecx, %esi
+; CHECK-NEXT: movl %edx, %ecx
+; CHECK-NEXT: andl $4, %ecx
+; CHECK-NEXT: shll $11, %ecx
+; CHECK-NEXT: orl %esi, %ecx
+; CHECK-NEXT: movl %edx, %esi
+; CHECK-NEXT: andl $8, %esi
+; CHECK-NEXT: shll $9, %esi
+; CHECK-NEXT: orl %ecx, %esi
+; CHECK-NEXT: movl %edx, %edi
+; CHECK-NEXT: andl $16, %edi
+; CHECK-NEXT: shll $7, %edi
+; CHECK-NEXT: orl %esi, %edi
+; CHECK-NEXT: movl %edx, %ecx
+; CHECK-NEXT: andl $32, %ecx
+; CHECK-NEXT: shll $5, %ecx
+; CHECK-NEXT: orl %edi, %ecx
+; CHECK-NEXT: movl %edx, %esi
+; CHECK-NEXT: andl $64, %esi
+; CHECK-NEXT: shll $3, %esi
+; CHECK-NEXT: leal (%edx,%edx), %edi
+; CHECK-NEXT: andl $256, %edi # imm = 0x100
+; CHECK-NEXT: orl %esi, %edi
+; CHECK-NEXT: movl %edx, %esi
+; CHECK-NEXT: shrl %esi
+; CHECK-NEXT: andl $128, %esi
+; CHECK-NEXT: orl %edi, %esi
+; CHECK-NEXT: movl %edx, %edi
+; CHECK-NEXT: shrl $3, %edi
+; CHECK-NEXT: andl $64, %edi
+; CHECK-NEXT: orl %esi, %edi
+; CHECK-NEXT: movl %edx, %esi
+; CHECK-NEXT: shrl $5, %esi
+; CHECK-NEXT: andl $32, %esi
+; CHECK-NEXT: orl %edi, %esi
+; CHECK-NEXT: movl %edx, %edi
+; CHECK-NEXT: shrl $7, %edi
+; CHECK-NEXT: andl $16, %edi
+; CHECK-NEXT: orl %esi, %edi
+; CHECK-NEXT: movl %edx, %esi
+; CHECK-NEXT: shrl $9, %esi
+; CHECK-NEXT: andl $8, %esi
+; CHECK-NEXT: orl %edi, %esi
+; CHECK-NEXT: movl %edx, %edi
+; CHECK-NEXT: shrl $11, %edi
+; CHECK-NEXT: andl $4, %edi
+; CHECK-NEXT: orl %esi, %edi
+; CHECK-NEXT: movl %edx, %esi
+; CHECK-NEXT: shrl $13, %esi
+; CHECK-NEXT: andl $2, %esi
+; CHECK-NEXT: orl %edi, %esi
+; CHECK-NEXT: shrl $15, %edx
+; CHECK-NEXT: orl %esi, %edx
+; CHECK-NEXT: orl %ecx, %edx
+; CHECK-NEXT: # kill: %AX<def> %AX<kill> %EAX<kill>
+; CHECK-NEXT: # kill: %DX<def> %DX<kill> %EDX<kill>
+; CHECK-NEXT: popl %esi
+; CHECK-NEXT: popl %edi
+; CHECK-NEXT: retl
%b = call <2 x i16> @llvm.bitreverse.v2i16(<2 x i16> %a)
ret <2 x i16> %b
}
+declare i24 @llvm.bitreverse.i24(i24) readnone
+
+define i24 @test_bitreverse_i24(i24 %a) nounwind {
+; CHECK-LABEL: test_bitreverse_i24:
+; CHECK: # BB#0:
+; CHECK-NEXT: pushl %esi
+; CHECK-NEXT: movl {{[0-9]+}}(%esp), %eax
+; CHECK-NEXT: movl %eax, %ecx
+; CHECK-NEXT: shll $31, %ecx
+; CHECK-NEXT: movl %eax, %edx
+; CHECK-NEXT: andl $2, %edx
+; CHECK-NEXT: shll $29, %edx
+; CHECK-NEXT: orl %ecx, %edx
+; CHECK-NEXT: movl %eax, %ecx
+; CHECK-NEXT: andl $4, %ecx
+; CHECK-NEXT: shll $27, %ecx
+; CHECK-NEXT: orl %edx, %ecx
+; CHECK-NEXT: movl %eax, %edx
+; CHECK-NEXT: andl $8, %edx
+; CHECK-NEXT: shll $25, %edx
+; CHECK-NEXT: orl %ecx, %edx
+; CHECK-NEXT: movl %eax, %esi
+; CHECK-NEXT: andl $16, %esi
+; CHECK-NEXT: shll $23, %esi
+; CHECK-NEXT: orl %edx, %esi
+; CHECK-NEXT: movl %eax, %ecx
+; CHECK-NEXT: andl $32, %ecx
+; CHECK-NEXT: shll $21, %ecx
+; CHECK-NEXT: orl %esi, %ecx
+; CHECK-NEXT: movl %eax, %edx
+; CHECK-NEXT: andl $64, %edx
+; CHECK-NEXT: shll $19, %edx
+; CHECK-NEXT: movl %eax, %esi
+; CHECK-NEXT: shll $17, %esi
+; CHECK-NEXT: andl $16777216, %esi # imm = 0x1000000
+; CHECK-NEXT: orl %edx, %esi
+; CHECK-NEXT: movl %eax, %edx
+; CHECK-NEXT: shll $15, %edx
+; CHECK-NEXT: andl $8388608, %edx # imm = 0x800000
+; CHECK-NEXT: orl %esi, %edx
+; CHECK-NEXT: movl %eax, %esi
+; CHECK-NEXT: shll $13, %esi
+; CHECK-NEXT: andl $4194304, %esi # imm = 0x400000
+; CHECK-NEXT: orl %edx, %esi
+; CHECK-NEXT: movl %eax, %edx
+; CHECK-NEXT: shll $11, %edx
+; CHECK-NEXT: andl $2097152, %edx # imm = 0x200000
+; CHECK-NEXT: orl %esi, %edx
+; CHECK-NEXT: movl %eax, %esi
+; CHECK-NEXT: shll $9, %esi
+; CHECK-NEXT: andl $1048576, %esi # imm = 0x100000
+; CHECK-NEXT: orl %edx, %esi
+; CHECK-NEXT: movl %eax, %edx
+; CHECK-NEXT: shll $7, %edx
+; CHECK-NEXT: andl $524288, %edx # imm = 0x80000
+; CHECK-NEXT: orl %esi, %edx
+; CHECK-NEXT: movl %eax, %esi
+; CHECK-NEXT: shll $5, %esi
+; CHECK-NEXT: andl $262144, %esi # imm = 0x40000
+; CHECK-NEXT: orl %edx, %esi
+; CHECK-NEXT: leal (,%eax,8), %edx
+; CHECK-NEXT: andl $131072, %edx # imm = 0x20000
+; CHECK-NEXT: orl %esi, %edx
+; CHECK-NEXT: leal (%eax,%eax), %esi
+; CHECK-NEXT: andl $65536, %esi # imm = 0x10000
+; CHECK-NEXT: orl %edx, %esi
+; CHECK-NEXT: movl %eax, %edx
+; CHECK-NEXT: shrl %edx
+; CHECK-NEXT: andl $32768, %edx # imm = 0x8000
+; CHECK-NEXT: orl %esi, %edx
+; CHECK-NEXT: movl %eax, %esi
+; CHECK-NEXT: shrl $3, %esi
+; CHECK-NEXT: andl $16384, %esi # imm = 0x4000
+; CHECK-NEXT: orl %edx, %esi
+; CHECK-NEXT: movl %eax, %edx
+; CHECK-NEXT: shrl $5, %edx
+; CHECK-NEXT: andl $8192, %edx # imm = 0x2000
+; CHECK-NEXT: orl %esi, %edx
+; CHECK-NEXT: movl %eax, %esi
+; CHECK-NEXT: shrl $7, %esi
+; CHECK-NEXT: andl $4096, %esi # imm = 0x1000
+; CHECK-NEXT: orl %edx, %esi
+; CHECK-NEXT: movl %eax, %edx
+; CHECK-NEXT: shrl $9, %edx
+; CHECK-NEXT: andl $2048, %edx # imm = 0x800
+; CHECK-NEXT: orl %esi, %edx
+; CHECK-NEXT: movl %eax, %esi
+; CHECK-NEXT: shrl $11, %esi
+; CHECK-NEXT: andl $1024, %esi # imm = 0x400
+; CHECK-NEXT: orl %edx, %esi
+; CHECK-NEXT: movl %eax, %edx
+; CHECK-NEXT: shrl $13, %edx
+; CHECK-NEXT: andl $512, %edx # imm = 0x200
+; CHECK-NEXT: orl %esi, %edx
+; CHECK-NEXT: shrl $15, %eax
+; CHECK-NEXT: andl $256, %eax # imm = 0x100
+; CHECK-NEXT: orl %edx, %eax
+; CHECK-NEXT: orl %ecx, %eax
+; CHECK-NEXT: shrl $8, %eax
+; CHECK-NEXT: popl %esi
+; CHECK-NEXT: retl
+ %b = call i24 @llvm.bitreverse.i24(i24 %a)
+ ret i24 %b
+}
+
declare i8 @llvm.bitreverse.i8(i8) readnone
-define i8 @g(i8 %a) {
-; CHECK-LABEL: g:
-; CHECK: shlb
+define i8 @test_bitreverse_i8(i8 %a) {
+; CHECK-LABEL: test_bitreverse_i8:
+; CHECK: # BB#0:
+; CHECK-NEXT: movb {{[0-9]+}}(%esp), %al
+; CHECK-NEXT: movl %eax, %ecx
+; CHECK-NEXT: shlb $7, %cl
+; CHECK-NEXT: movl %eax, %edx
+; CHECK-NEXT: shlb $5, %dl
+; CHECK-NEXT: andb $64, %dl
+; CHECK-NEXT: movb %al, %ah
+; CHECK-NEXT: shlb $3, %ah
+; CHECK-NEXT: andb $32, %ah
+; CHECK-NEXT: orb %dl, %ah
+; CHECK-NEXT: movl %eax, %edx
+; CHECK-NEXT: addb %dl, %dl
+; CHECK-NEXT: andb $16, %dl
+; CHECK-NEXT: orb %ah, %dl
+; CHECK-NEXT: movb %al, %ah
+; CHECK-NEXT: shrb %ah
+; CHECK-NEXT: andb $8, %ah
+; CHECK-NEXT: orb %dl, %ah
+; CHECK-NEXT: movl %eax, %edx
+; CHECK-NEXT: shrb $3, %dl
+; CHECK-NEXT: andb $4, %dl
+; CHECK-NEXT: orb %ah, %dl
+; CHECK-NEXT: movb %al, %ah
+; CHECK-NEXT: shrb $5, %ah
+; CHECK-NEXT: andb $2, %ah
+; CHECK-NEXT: orb %dl, %ah
+; CHECK-NEXT: shrb $7, %al
+; CHECK-NEXT: orb %ah, %al
+; CHECK-NEXT: orb %cl, %al
+; CHECK-NEXT: retl
%b = call i8 @llvm.bitreverse.i8(i8 %a)
ret i8 %b
}
+
+declare i4 @llvm.bitreverse.i4(i4) readnone
+
+define i4 @test_bitreverse_i4(i4 %a) {
+; CHECK-LABEL: test_bitreverse_i4:
+; CHECK: # BB#0:
+; CHECK-NEXT: movb {{[0-9]+}}(%esp), %al
+; CHECK-NEXT: movl %eax, %ecx
+; CHECK-NEXT: shlb $7, %cl
+; CHECK-NEXT: movl %eax, %edx
+; CHECK-NEXT: shlb $5, %dl
+; CHECK-NEXT: andb $64, %dl
+; CHECK-NEXT: movb %al, %ah
+; CHECK-NEXT: shlb $3, %ah
+; CHECK-NEXT: andb $32, %ah
+; CHECK-NEXT: orb %dl, %ah
+; CHECK-NEXT: addb %al, %al
+; CHECK-NEXT: andb $16, %al
+; CHECK-NEXT: orb %ah, %al
+; CHECK-NEXT: orb %cl, %al
+; CHECK-NEXT: shrb $4, %al
+; CHECK-NEXT: retl
+ %b = call i4 @llvm.bitreverse.i4(i4 %a)
+ ret i4 %b
+}
+
+; These tests check that bitreverse(constant) calls are folded
+
+define <2 x i16> @fold_v2i16() {
+; CHECK-LABEL: fold_v2i16:
+; CHECK: # BB#0:
+; CHECK-NEXT: movw $-4096, %ax # imm = 0xF000
+; CHECK-NEXT: movw $240, %dx
+; CHECK-NEXT: retl
+ %b = call <2 x i16> @llvm.bitreverse.v2i16(<2 x i16> <i16 15, i16 3840>)
+ ret <2 x i16> %b
+}
+
+define i24 @fold_i24() {
+; CHECK-LABEL: fold_i24:
+; CHECK: # BB#0:
+; CHECK-NEXT: movl $2048, %eax # imm = 0x800
+; CHECK-NEXT: retl
+ %b = call i24 @llvm.bitreverse.i24(i24 4096)
+ ret i24 %b
+}
+
+define i8 @fold_i8() {
+; CHECK-LABEL: fold_i8:
+; CHECK: # BB#0:
+; CHECK-NEXT: movb $-16, %al
+; CHECK-NEXT: retl
+ %b = call i8 @llvm.bitreverse.i8(i8 15)
+ ret i8 %b
+}
+
+define i4 @fold_i4() {
+; CHECK-LABEL: fold_i4:
+; CHECK: # BB#0:
+; CHECK-NEXT: movb $1, %al
+; CHECK-NEXT: retl
+ %b = call i4 @llvm.bitreverse.i4(i4 8)
+ ret i4 %b
+}
+
+; These tests check that bitreverse(bitreverse()) calls are removed
+
+define i8 @identity_i8(i8 %a) {
+; CHECK-LABEL: identity_i8:
+; CHECK: # BB#0:
+; CHECK-NEXT: movb {{[0-9]+}}(%esp), %al
+; CHECK-NEXT: retl
+ %b = call i8 @llvm.bitreverse.i8(i8 %a)
+ %c = call i8 @llvm.bitreverse.i8(i8 %b)
+ ret i8 %c
+}
+
+define <2 x i16> @identity_v2i16(<2 x i16> %a) {
+; CHECK-LABEL: identity_v2i16:
+; CHECK: # BB#0:
+; CHECK-NEXT: movzwl {{[0-9]+}}(%esp), %eax
+; CHECK-NEXT: movzwl {{[0-9]+}}(%esp), %edx
+; CHECK-NEXT: retl
+ %b = call <2 x i16> @llvm.bitreverse.v2i16(<2 x i16> %a)
+ %c = call <2 x i16> @llvm.bitreverse.v2i16(<2 x i16> %b)
+ ret <2 x i16> %c
+}
+
+; These tests check that bitreverse(undef) calls are removed
+
+define i8 @undef_i8() {
+; CHECK-LABEL: undef_i8:
+; CHECK: # BB#0:
+; CHECK-NEXT: retl
+ %b = call i8 @llvm.bitreverse.i8(i8 undef)
+ ret i8 %b
+}
+
+define <2 x i16> @undef_v2i16() {
+; CHECK-LABEL: undef_v2i16:
+; CHECK: # BB#0:
+; CHECK-NEXT: retl
+ %b = call <2 x i16> @llvm.bitreverse.v2i16(<2 x i16> undef)
+ ret <2 x i16> %b
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-31 14:28:10 +0000