[DAGCombiner] Push truncate through adde when the carry isn't used.
Summary: As per title.
Reviewers: mkuper, spatel, bkramer, RKSimon, zvi
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D29528
llvm-svn: 294394
diff --git a/llvm/test/CodeGen/X86/adde-carry.ll b/llvm/test/CodeGen/X86/adde-carry.ll
index e111f68..9483a6b 100644
--- a/llvm/test/CodeGen/X86/adde-carry.ll
+++ b/llvm/test/CodeGen/X86/adde-carry.ll
@@ -28,8 +28,7 @@
; CHECK-LABEL: b:
; CHECK: # BB#0: # %entry
; CHECK-NEXT: addq %rdx, %rsi
-; CHECK-NEXT: sbbq %rax, %rax
-; CHECK-NEXT: subl %eax, %ecx
+; CHECK-NEXT: adcl $0, %ecx
; CHECK-NEXT: movl %ecx, (%rdi)
; CHECK-NEXT: retq
entry:
@@ -48,8 +47,7 @@
; CHECK-LABEL: c:
; CHECK: # BB#0: # %entry
; CHECK-NEXT: addq %rdx, %rsi
-; CHECK-NEXT: sbbq %rax, %rax
-; CHECK-NEXT: subl %eax, %ecx
+; CHECK-NEXT: adcl $0, %ecx
; CHECK-NEXT: movw %cx, (%rdi)
; CHECK-NEXT: retq
entry:
@@ -68,8 +66,7 @@
; CHECK-LABEL: d:
; CHECK: # BB#0: # %entry
; CHECK-NEXT: addq %rdx, %rsi
-; CHECK-NEXT: sbbq %rax, %rax
-; CHECK-NEXT: subl %eax, %ecx
+; CHECK-NEXT: adcl $0, %ecx
; CHECK-NEXT: movb %cl, (%rdi)
; CHECK-NEXT: retq
entry:
@@ -165,8 +162,8 @@
; CHECK-NEXT: adcq $0, %rdx
; CHECK-NEXT: movq %rax, (%rdi)
; CHECK-NEXT: addq 8(%rdi), %rdx
-; CHECK-NEXT: sbbq %rax, %rax
; CHECK-NEXT: movq %rdx, 8(%rdi)
+; CHECK-NEXT: sbbl %eax, %eax
; CHECK-NEXT: subl %eax, 16(%rdi)
; CHECK-NEXT: retq
entry:
diff --git a/llvm/test/CodeGen/X86/known-bits.ll b/llvm/test/CodeGen/X86/known-bits.ll
index f3fa127..e458d7ab 100644
--- a/llvm/test/CodeGen/X86/known-bits.ll
+++ b/llvm/test/CodeGen/X86/known-bits.ll
@@ -151,8 +151,7 @@
; X64-NEXT: andq $-1024, %rdi # imm = 0xFC00
; X64-NEXT: andq $-1024, %rsi # imm = 0xFC00
; X64-NEXT: addq %rdi, %rsi
-; X64-NEXT: sbbq %rax, %rax
-; X64-NEXT: subl %eax, %edx
+; X64-NEXT: adcl $0, %edx
; X64-NEXT: shldq $54, %rsi, %rdx
; X64-NEXT: xorl %eax, %eax
; X64-NEXT: retq