[PowerPC] Eliminate integer compare instructions - vol. 1

This patch is the first in a series of patches to provide code gen for
doing compares in GPRs when the compare result is required in a GPR.

It adds the infrastructure to select GPR sequences for i1->i32 and i1->i64
extensions. This first patch handles equality comparison on i32 operands with
the result sign or zero extended.

Differential Revision: https://reviews.llvm.org/D31847


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@302810 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 137 insertions, 0 deletions

diff --git a/test/CodeGen/PowerPC/testCompareslleqss.ll b/test/CodeGen/PowerPC/testCompareslleqss.ll
new file mode 100644
index 00000000000..df60a6ccc00
--- /dev/null
+++ b/test/CodeGen/PowerPC/testCompareslleqss.ll
@@ -0,0 +1,137 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -verify-machineinstrs -mtriple=powerpc64-unknown-linux-gnu -O2 \
+; RUN:   -ppc-asm-full-reg-names -mcpu=pwr8 < %s | FileCheck %s \
+; RUN:  --implicit-check-not cmpw --implicit-check-not cmpd --implicit-check-not cmpl
+; RUN: llc -verify-machineinstrs -mtriple=powerpc64le-unknown-linux-gnu -O2 \
+; RUN:   -ppc-asm-full-reg-names -mcpu=pwr8 < %s | FileCheck %s \
+; RUN:  --implicit-check-not cmpw --implicit-check-not cmpd --implicit-check-not cmpl
+
+@glob = common local_unnamed_addr global i16 0, align 2
+
+; Function Attrs: norecurse nounwind readnone
+define i64 @test_lleqss(i16 signext %a, i16 signext %b) {
+; CHECK-LABEL: test_lleqss:
+; CHECK:       # BB#0: # %entry
+; CHECK-NEXT:    xor r3, r3, r4
+; CHECK-NEXT:    cntlzw r3, r3
+; CHECK-NEXT:    srwi r3, r3, 5
+; CHECK-NEXT:    blr
+entry:
+  %cmp = icmp eq i16 %a, %b
+  %conv3 = zext i1 %cmp to i64
+  ret i64 %conv3
+}
+
+; Function Attrs: norecurse nounwind readnone
+define i64 @test_lleqss_sext(i16 signext %a, i16 signext %b) {
+; CHECK-LABEL: test_lleqss_sext:
+; CHECK:       # BB#0: # %entry
+; CHECK-NEXT:    xor r3, r3, r4
+; CHECK-NEXT:    cntlzw r3, r3
+; CHECK-NEXT:    rldicr r3, r3, 58, 0
+; CHECK-NEXT:    sradi r3, r3, 63
+; CHECK-NEXT:    blr
+entry:
+  %cmp = icmp eq i16 %a, %b
+  %conv3 = sext i1 %cmp to i64
+  ret i64 %conv3
+}
+
+; Function Attrs: norecurse nounwind readnone
+define i64 @test_lleqss_z(i16 signext %a) {
+; CHECK-LABEL: test_lleqss_z:
+; CHECK:       # BB#0: # %entry
+; CHECK-NEXT:    cntlzw r3, r3
+; CHECK-NEXT:    srwi r3, r3, 5
+; CHECK-NEXT:    blr
+entry:
+  %cmp = icmp eq i16 %a, 0
+  %conv2 = zext i1 %cmp to i64
+  ret i64 %conv2
+}
+
+; Function Attrs: norecurse nounwind readnone
+define i64 @test_lleqss_sext_z(i16 signext %a) {
+; CHECK-LABEL: test_lleqss_sext_z:
+; CHECK:       # BB#0: # %entry
+; CHECK-NEXT:    cntlzw r3, r3
+; CHECK-NEXT:    rldicr r3, r3, 58, 0
+; CHECK-NEXT:    sradi r3, r3, 63
+; CHECK-NEXT:    blr
+entry:
+  %cmp = icmp eq i16 %a, 0
+  %conv2 = sext i1 %cmp to i64
+  ret i64 %conv2
+}
+
+; Function Attrs: norecurse nounwind
+define void @test_lleqss_store(i16 signext %a, i16 signext %b) {
+; CHECK-LABEL: test_lleqss_store:
+; CHECK:       # BB#0: # %entry
+; CHECK-NEXT:    addis r5, r2, .LC0@toc@ha
+; CHECK-NEXT:    xor r3, r3, r4
+; CHECK-NEXT:    ld r12, .LC0@toc@l(r5)
+; CHECK-NEXT:    cntlzw r3, r3
+; CHECK-NEXT:    srwi r3, r3, 5
+; CHECK-NEXT:    sth r3, 0(r12)
+; CHECK-NEXT:    blr
+entry:
+  %cmp = icmp eq i16 %a, %b
+  %conv3 = zext i1 %cmp to i16
+  store i16 %conv3, i16* @glob, align 2
+  ret void
+}
+
+; Function Attrs: norecurse nounwind
+define void @test_lleqss_sext_store(i16 signext %a, i16 signext %b) {
+; CHECK-LABEL: test_lleqss_sext_store:
+; CHECK:       # BB#0: # %entry
+; CHECK-NEXT:    xor r3, r3, r4
+; CHECK-NEXT:    addis r5, r2, .LC0@toc@ha
+; CHECK-NEXT:    cntlzw r3, r3
+; CHECK-NEXT:    ld r4, .LC0@toc@l(r5)
+; CHECK-NEXT:    rldicr r3, r3, 58, 0
+; CHECK-NEXT:    sradi r3, r3, 63
+; CHECK-NEXT:    sth r3, 0(r4)
+; CHECK-NEXT:    blr
+entry:
+  %cmp = icmp eq i16 %a, %b
+  %conv3 = sext i1 %cmp to i16
+  store i16 %conv3, i16* @glob, align 2
+  ret void
+}
+
+; Function Attrs: norecurse nounwind
+define void @test_lleqss_z_store(i16 signext %a) {
+; CHECK-LABEL: test_lleqss_z_store:
+; CHECK:       # BB#0: # %entry
+; CHECK-NEXT:    addis r4, r2, .LC0@toc@ha
+; CHECK-NEXT:    cntlzw r3, r3
+; CHECK-NEXT:    ld r4, .LC0@toc@l(r4)
+; CHECK-NEXT:    srwi r3, r3, 5
+; CHECK-NEXT:    sth r3, 0(r4)
+; CHECK-NEXT:    blr
+entry:
+  %cmp = icmp eq i16 %a, 0
+  %conv2 = zext i1 %cmp to i16
+  store i16 %conv2, i16* @glob, align 2
+  ret void
+}
+
+; Function Attrs: norecurse nounwind
+define void @test_lleqss_sext_z_store(i16 signext %a) {
+; CHECK-LABEL: test_lleqss_sext_z_store:
+; CHECK:       # BB#0: # %entry
+; CHECK-NEXT:    addis r4, r2, .LC0@toc@ha
+; CHECK-NEXT:    cntlzw r3, r3
+; CHECK-NEXT:    ld r4, .LC0@toc@l(r4)
+; CHECK-NEXT:    rldicr r3, r3, 58, 0
+; CHECK-NEXT:    sradi r3, r3, 63
+; CHECK-NEXT:    sth r3, 0(r4)
+; CHECK-NEXT:    blr
+entry:
+  %cmp = icmp eq i16 %a, 0
+  %conv2 = sext i1 %cmp to i16
+  store i16 %conv2, i16* @glob, align 2
+  ret void
+}