[X86][NFC] Add proper test for promotion of i8 cmov's of trunc's

There was no proper test for that code in X86TargetLowering::LowerSELECT().
Noticed accidentally while trying to modify the last branch in that function.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@355452 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/CodeGen/X86/8bit_cmov_of_trunc_promotion.ll b/test/CodeGen/X86/8bit_cmov_of_trunc_promotion.ll
new file mode 100644 (file)
index 0000000..ff4dcfa
--- /dev/null
+++ b/test/CodeGen/X86/8bit_cmov_of_trunc_promotion.ll
@@ -0,0 +1,271 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -mtriple=i386-unknown-unknown -mattr=-cmov | FileCheck %s --check-prefixes=ALL,I386,I386-NOCMOV
+; RUN: llc < %s -mtriple=i386-unknown-unknown -mattr=+cmov | FileCheck %s --check-prefixes=ALL,I386,I386-CMOV
+; RUN: llc < %s -mtriple=i686-unknown-unknown -mattr=-cmov | FileCheck %s --check-prefixes=ALL,I686,I686-NOCMOV
+; RUN: llc < %s -mtriple=i686-unknown-unknown -mattr=+cmov | FileCheck %s --check-prefixes=ALL,I686,I686-CMOV
+; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=-cmov | FileCheck %s --check-prefixes=ALL,X86_64,X86_64-NOCMOV
+; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=+cmov | FileCheck %s --check-prefixes=ALL,X86_64,X86_64-CMOV
+
+; Values don't come from regs. All good.
+
+define i8 @t0(i32 %a1_wide_orig, i32 %a2_wide_orig, i32 %inc) nounwind {
+; I386-NOCMOV-LABEL: t0:
+; I386-NOCMOV:       # %bb.0:
+; I386-NOCMOV-NEXT:    movl {{[0-9]+}}(%esp), %ecx
+; I386-NOCMOV-NEXT:    movl {{[0-9]+}}(%esp), %eax
+; I386-NOCMOV-NEXT:    addl %ecx, %eax
+; I386-NOCMOV-NEXT:    addl {{[0-9]+}}(%esp), %ecx
+; I386-NOCMOV-NEXT:    cmpb %cl, %al
+; I386-NOCMOV-NEXT:    jge .LBB0_2
+; I386-NOCMOV-NEXT:  # %bb.1:
+; I386-NOCMOV-NEXT:    movl %ecx, %eax
+; I386-NOCMOV-NEXT:  .LBB0_2:
+; I386-NOCMOV-NEXT:    # kill: def $al killed $al killed $eax
+; I386-NOCMOV-NEXT:    retl
+;
+; I386-CMOV-LABEL: t0:
+; I386-CMOV:       # %bb.0:
+; I386-CMOV-NEXT:    movl {{[0-9]+}}(%esp), %eax
+; I386-CMOV-NEXT:    movl {{[0-9]+}}(%esp), %ecx
+; I386-CMOV-NEXT:    addl %eax, %ecx
+; I386-CMOV-NEXT:    addl {{[0-9]+}}(%esp), %eax
+; I386-CMOV-NEXT:    cmpb %al, %cl
+; I386-CMOV-NEXT:    cmovgel %ecx, %eax
+; I386-CMOV-NEXT:    # kill: def $al killed $al killed $eax
+; I386-CMOV-NEXT:    retl
+;
+; I686-NOCMOV-LABEL: t0:
+; I686-NOCMOV:       # %bb.0:
+; I686-NOCMOV-NEXT:    movl {{[0-9]+}}(%esp), %ecx
+; I686-NOCMOV-NEXT:    movl {{[0-9]+}}(%esp), %eax
+; I686-NOCMOV-NEXT:    addl %ecx, %eax
+; I686-NOCMOV-NEXT:    addl {{[0-9]+}}(%esp), %ecx
+; I686-NOCMOV-NEXT:    cmpb %cl, %al
+; I686-NOCMOV-NEXT:    jge .LBB0_2
+; I686-NOCMOV-NEXT:  # %bb.1:
+; I686-NOCMOV-NEXT:    movl %ecx, %eax
+; I686-NOCMOV-NEXT:  .LBB0_2:
+; I686-NOCMOV-NEXT:    # kill: def $al killed $al killed $eax
+; I686-NOCMOV-NEXT:    retl
+;
+; I686-CMOV-LABEL: t0:
+; I686-CMOV:       # %bb.0:
+; I686-CMOV-NEXT:    movl {{[0-9]+}}(%esp), %eax
+; I686-CMOV-NEXT:    movl {{[0-9]+}}(%esp), %ecx
+; I686-CMOV-NEXT:    addl %eax, %ecx
+; I686-CMOV-NEXT:    addl {{[0-9]+}}(%esp), %eax
+; I686-CMOV-NEXT:    cmpb %al, %cl
+; I686-CMOV-NEXT:    cmovgel %ecx, %eax
+; I686-CMOV-NEXT:    # kill: def $al killed $al killed $eax
+; I686-CMOV-NEXT:    retl
+;
+; X86_64-LABEL: t0:
+; X86_64:       # %bb.0:
+; X86_64-NEXT:    movl %esi, %eax
+; X86_64-NEXT:    addl %edx, %edi
+; X86_64-NEXT:    addl %edx, %eax
+; X86_64-NEXT:    cmpb %al, %dil
+; X86_64-NEXT:    cmovgel %edi, %eax
+; X86_64-NEXT:    # kill: def $al killed $al killed $eax
+; X86_64-NEXT:    retq
+  %a1_wide = add i32 %a1_wide_orig, %inc
+  %a2_wide = add i32 %a2_wide_orig, %inc
+  %a1 = trunc i32 %a1_wide to i8
+  %a2 = trunc i32 %a2_wide to i8
+  %t1 = icmp sgt i8 %a1, %a2
+  %t2 = select i1 %t1, i8 %a1, i8 %a2
+  ret i8 %t2
+}
+
+; Values don't come from regs, but there is only one truncation.
+
+define i8 @neg_only_one_truncation(i32 %a1_wide_orig, i8 %a2_orig, i32 %inc) nounwind {
+; I386-LABEL: neg_only_one_truncation:
+; I386:       # %bb.0:
+; I386-NEXT:    movl {{[0-9]+}}(%esp), %ecx
+; I386-NEXT:    movl {{[0-9]+}}(%esp), %eax
+; I386-NEXT:    addl %ecx, %eax
+; I386-NEXT:    addb {{[0-9]+}}(%esp), %cl
+; I386-NEXT:    cmpb %cl, %al
+; I386-NEXT:    jge .LBB1_2
+; I386-NEXT:  # %bb.1:
+; I386-NEXT:    movl %ecx, %eax
+; I386-NEXT:  .LBB1_2:
+; I386-NEXT:    # kill: def $al killed $al killed $eax
+; I386-NEXT:    retl
+;
+; I686-LABEL: neg_only_one_truncation:
+; I686:       # %bb.0:
+; I686-NEXT:    movl {{[0-9]+}}(%esp), %ecx
+; I686-NEXT:    movl {{[0-9]+}}(%esp), %eax
+; I686-NEXT:    addl %ecx, %eax
+; I686-NEXT:    addb {{[0-9]+}}(%esp), %cl
+; I686-NEXT:    cmpb %cl, %al
+; I686-NEXT:    jge .LBB1_2
+; I686-NEXT:  # %bb.1:
+; I686-NEXT:    movl %ecx, %eax
+; I686-NEXT:  .LBB1_2:
+; I686-NEXT:    # kill: def $al killed $al killed $eax
+; I686-NEXT:    retl
+;
+; X86_64-LABEL: neg_only_one_truncation:
+; X86_64:       # %bb.0:
+; X86_64-NEXT:    movl %edi, %eax
+; X86_64-NEXT:    addl %edx, %eax
+; X86_64-NEXT:    addb %sil, %dl
+; X86_64-NEXT:    cmpb %dl, %al
+; X86_64-NEXT:    jge .LBB1_2
+; X86_64-NEXT:  # %bb.1:
+; X86_64-NEXT:    movl %edx, %eax
+; X86_64-NEXT:  .LBB1_2:
+; X86_64-NEXT:    # kill: def $al killed $al killed $eax
+; X86_64-NEXT:    retq
+  %a1_wide = add i32 %a1_wide_orig, %inc
+  %inc_short = trunc i32 %inc to i8
+  %a2 = add i8 %a2_orig, %inc_short
+  %a1 = trunc i32 %a1_wide to i8
+  %t1 = icmp sgt i8 %a1, %a2
+  %t2 = select i1 %t1, i8 %a1, i8 %a2
+  ret i8 %t2
+}
+
+; Values don't come from regs, but truncation from different types.
+
+define i8 @neg_type_mismatch(i32 %a1_wide_orig, i16 %a2_wide_orig, i32 %inc) nounwind {
+; I386-LABEL: neg_type_mismatch:
+; I386:       # %bb.0:
+; I386-NEXT:    movl {{[0-9]+}}(%esp), %ecx
+; I386-NEXT:    movl {{[0-9]+}}(%esp), %eax
+; I386-NEXT:    addl %ecx, %eax
+; I386-NEXT:    addw {{[0-9]+}}(%esp), %cx
+; I386-NEXT:    cmpb %cl, %al
+; I386-NEXT:    jge .LBB2_2
+; I386-NEXT:  # %bb.1:
+; I386-NEXT:    movl %ecx, %eax
+; I386-NEXT:  .LBB2_2:
+; I386-NEXT:    # kill: def $al killed $al killed $eax
+; I386-NEXT:    retl
+;
+; I686-LABEL: neg_type_mismatch:
+; I686:       # %bb.0:
+; I686-NEXT:    movl {{[0-9]+}}(%esp), %ecx
+; I686-NEXT:    movl {{[0-9]+}}(%esp), %eax
+; I686-NEXT:    addl %ecx, %eax
+; I686-NEXT:    addw {{[0-9]+}}(%esp), %cx
+; I686-NEXT:    cmpb %cl, %al
+; I686-NEXT:    jge .LBB2_2
+; I686-NEXT:  # %bb.1:
+; I686-NEXT:    movl %ecx, %eax
+; I686-NEXT:  .LBB2_2:
+; I686-NEXT:    # kill: def $al killed $al killed $eax
+; I686-NEXT:    retl
+;
+; X86_64-LABEL: neg_type_mismatch:
+; X86_64:       # %bb.0:
+; X86_64-NEXT:    movl %edi, %eax
+; X86_64-NEXT:    addl %edx, %eax
+; X86_64-NEXT:    addl %edx, %esi
+; X86_64-NEXT:    cmpb %sil, %al
+; X86_64-NEXT:    jge .LBB2_2
+; X86_64-NEXT:  # %bb.1:
+; X86_64-NEXT:    movl %esi, %eax
+; X86_64-NEXT:  .LBB2_2:
+; X86_64-NEXT:    # kill: def $al killed $al killed $eax
+; X86_64-NEXT:    retq
+  %a1_wide = add i32 %a1_wide_orig, %inc
+  %inc_short = trunc i32 %inc to i16
+  %a2_wide = add i16 %a2_wide_orig, %inc_short
+  %a1 = trunc i32 %a1_wide to i8
+  %a2 = trunc i16 %a2_wide to i8
+  %t1 = icmp sgt i8 %a1, %a2
+  %t2 = select i1 %t1, i8 %a1, i8 %a2
+  ret i8 %t2
+}
+
+; One value come from regs
+
+define i8 @negative_CopyFromReg(i32 %a1_wide, i32 %a2_wide_orig, i32 %inc) nounwind {
+; I386-LABEL: negative_CopyFromReg:
+; I386:       # %bb.0:
+; I386-NEXT:    movb {{[0-9]+}}(%esp), %al
+; I386-NEXT:    movl {{[0-9]+}}(%esp), %ecx
+; I386-NEXT:    addl {{[0-9]+}}(%esp), %ecx
+; I386-NEXT:    cmpb %cl, %al
+; I386-NEXT:    jge .LBB3_2
+; I386-NEXT:  # %bb.1:
+; I386-NEXT:    movl %ecx, %eax
+; I386-NEXT:  .LBB3_2:
+; I386-NEXT:    retl
+;
+; I686-LABEL: negative_CopyFromReg:
+; I686:       # %bb.0:
+; I686-NEXT:    movb {{[0-9]+}}(%esp), %al
+; I686-NEXT:    movl {{[0-9]+}}(%esp), %ecx
+; I686-NEXT:    addl {{[0-9]+}}(%esp), %ecx
+; I686-NEXT:    cmpb %cl, %al
+; I686-NEXT:    jge .LBB3_2
+; I686-NEXT:  # %bb.1:
+; I686-NEXT:    movl %ecx, %eax
+; I686-NEXT:  .LBB3_2:
+; I686-NEXT:    retl
+;
+; X86_64-LABEL: negative_CopyFromReg:
+; X86_64:       # %bb.0:
+; X86_64-NEXT:    movl %edi, %eax
+; X86_64-NEXT:    addl %edx, %esi
+; X86_64-NEXT:    cmpb %sil, %al
+; X86_64-NEXT:    jge .LBB3_2
+; X86_64-NEXT:  # %bb.1:
+; X86_64-NEXT:    movl %esi, %eax
+; X86_64-NEXT:  .LBB3_2:
+; X86_64-NEXT:    # kill: def $al killed $al killed $eax
+; X86_64-NEXT:    retq
+  %a2_wide = add i32 %a2_wide_orig, %inc
+  %a1 = trunc i32 %a1_wide to i8
+  %a2 = trunc i32 %a2_wide to i8
+  %t1 = icmp sgt i8 %a1, %a2
+  %t2 = select i1 %t1, i8 %a1, i8 %a2
+  ret i8 %t2
+}
+
+; Both values come from regs
+
+define i8 @negative_CopyFromRegs(i32 %a1_wide, i32 %a2_wide) nounwind {
+; I386-LABEL: negative_CopyFromRegs:
+; I386:       # %bb.0:
+; I386-NEXT:    movb {{[0-9]+}}(%esp), %cl
+; I386-NEXT:    movb {{[0-9]+}}(%esp), %al
+; I386-NEXT:    cmpb %cl, %al
+; I386-NEXT:    jge .LBB4_2
+; I386-NEXT:  # %bb.1:
+; I386-NEXT:    movl %ecx, %eax
+; I386-NEXT:  .LBB4_2:
+; I386-NEXT:    retl
+;
+; I686-LABEL: negative_CopyFromRegs:
+; I686:       # %bb.0:
+; I686-NEXT:    movb {{[0-9]+}}(%esp), %cl
+; I686-NEXT:    movb {{[0-9]+}}(%esp), %al
+; I686-NEXT:    cmpb %cl, %al
+; I686-NEXT:    jge .LBB4_2
+; I686-NEXT:  # %bb.1:
+; I686-NEXT:    movl %ecx, %eax
+; I686-NEXT:  .LBB4_2:
+; I686-NEXT:    retl
+;
+; X86_64-LABEL: negative_CopyFromRegs:
+; X86_64:       # %bb.0:
+; X86_64-NEXT:    movl %edi, %eax
+; X86_64-NEXT:    cmpb %sil, %al
+; X86_64-NEXT:    jge .LBB4_2
+; X86_64-NEXT:  # %bb.1:
+; X86_64-NEXT:    movl %esi, %eax
+; X86_64-NEXT:  .LBB4_2:
+; X86_64-NEXT:    # kill: def $al killed $al killed $eax
+; X86_64-NEXT:    retq
+  %a1 = trunc i32 %a1_wide to i8
+  %a2 = trunc i32 %a2_wide to i8
+  %t1 = icmp sgt i8 %a1, %a2
+  %t2 = select i1 %t1, i8 %a1, i8 %a2
+  ret i8 %t2
+}