PPC pre-increment load instructions do not have side effects

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178972 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/PowerPC/PPCInstr64Bit.td b/lib/Target/PowerPC/PPCInstr64Bit.td
index 6536ea4651b7cf9865579132d4bf55ff1e0157e0..16b983f8a50e824a8e08618baaa6240b4fa72d36 100644 (file)
--- a/lib/Target/PowerPC/PPCInstr64Bit.td
+++ b/lib/Target/PowerPC/PPCInstr64Bit.td
@@ -594,7 +594,7 @@ def LWZX8 : XForm_1<31,  23, (outs G8RC:$rD), (ins memrr:$src),
                    
                    
 // Update forms.
-let mayLoad = 1 in {
+let mayLoad = 1, neverHasSideEffects = 1 in {
 def LBZU8 : DForm_1<35, (outs G8RC:$rD, ptr_rc_nor0:$ea_result), (ins memri:$addr),
                     "lbzu $rD, $addr", LdStLoadUpd,
                     []>, RegConstraint<"$addr.reg = $ea_result">,
@@ -666,7 +666,7 @@ def LDBRX : XForm_1<31,  532, (outs G8RC:$rD), (ins memrr:$src),
                    "ldbrx $rD, $src", LdStLoad,
                    [(set i64:$rD, (PPClbrx xoaddr:$src, i64))]>, isPPC64;
 
-let mayLoad = 1 in
+let mayLoad = 1, neverHasSideEffects = 1 in
 def LDU  : DSForm_1<58, 1, (outs G8RC:$rD, ptr_rc_nor0:$ea_result), (ins memrix:$addr),
                     "ldu $rD, $addr", LdStLDU,
                     []>, RegConstraint<"$addr.reg = $ea_result">, isPPC64,

diff --git a/lib/Target/PowerPC/PPCInstrInfo.td b/lib/Target/PowerPC/PPCInstrInfo.td
index 86d020be4da84f1da7fe4596ec6dc54c18f4cca0..14f35ef0649fe9019b34b1b568bf824e35d6654a 100644 (file)
--- a/lib/Target/PowerPC/PPCInstrInfo.td
+++ b/lib/Target/PowerPC/PPCInstrInfo.td
@@ -757,7 +757,7 @@ def LFD : DForm_1<50, (outs F8RC:$rD), (ins memri:$src),
 
 
 // Unindexed (r+i) Loads with Update (preinc).
-let mayLoad = 1 in {
+let mayLoad = 1, neverHasSideEffects = 1 in {
 def LBZU : DForm_1<35, (outs GPRC:$rD, ptr_rc_nor0:$ea_result), (ins memri:$addr),
                    "lbzu $rD, $addr", LdStLoadUpd,
                    []>, RegConstraint<"$addr.reg = $ea_result">,