From: Jakub Jelinek <jakub@redhat.com>
Date: Tue, 10 Mar 2020 08:26:44 +0000 (+0100)
Subject: i386: Fix up *testqi_ext_3 insn&split for the *testdi_1 changes [PR94088]
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=cc5c935937d01d96c6b070dae31854180249064c;p=gcc.git

i386: Fix up *testqi_ext_3 insn&split for the *testdi_1 changes [PR94088]

In r10-1938-g460bf043c8266dd080308f4783137aee0d0f862c *testdi_1 has been
changed, so that if the mask has upper 32-bits 0 and then at least one bit
set, it requires CCZmode rather than CCNOmode, because in that case it uses
testl instruction rather than testq and so the SF flag wouldn't respect the
state of the 64-bit result.
The *testqi_ext_3 define_insn_and_split needs to match that though,
otherwise it can create an RTL pattern that used to match *testdi_1 but
doesn't anymore and we'd ICE due to an unrecognizable insn.

2020-03-10  Jakub Jelinek  <jakub@redhat.com>

	PR target/94088
	* config/i386/i386.md (*testqi_ext_3): Call ix86_match_ccmode with
	CCZmode instead of CCNOmode if operands[2] has DImode and pos + len
	is 32.

	* gcc.target/i386/pr94088.c: New test.
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 085ef66a207..5d5bbf4fed5 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2020-03-10  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/94088
+	* config/i386/i386.md (*testqi_ext_3): Call ix86_match_ccmode with
+	CCZmode instead of CCNOmode if operands[2] has DImode and pos + len
+	is 32.
+
 2020-03-09  Jason Merrill  <jason@redhat.com>
 
 	* gdbinit.in (pgs): Fix typo in documentation.
diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
index a4ee549567d..8b5ae34ee11 100644
--- a/gcc/config/i386/i386.md
+++ b/gcc/config/i386/i386.md
@@ -8826,18 +8826,23 @@
 	     (match_operand 3 "const_int_operand" "n")
 	     (match_operand 4 "const_int_operand" "n"))
 	   (const_int 0)]))]
-  "ix86_match_ccmode (insn, CCNOmode)
-   && ((TARGET_64BIT && GET_MODE (operands[2]) == DImode)
-       || GET_MODE (operands[2]) == SImode
-       || GET_MODE (operands[2]) == HImode
-       || GET_MODE (operands[2]) == QImode)
+  "((TARGET_64BIT && GET_MODE (operands[2]) == DImode)
+    || GET_MODE (operands[2]) == SImode
+    || GET_MODE (operands[2]) == HImode
+    || GET_MODE (operands[2]) == QImode)
    /* Ensure that resulting mask is zero or sign extended operand.  */
    && INTVAL (operands[4]) >= 0
    && ((INTVAL (operands[3]) > 0
 	&& INTVAL (operands[3]) + INTVAL (operands[4]) <= 32)
        || (<MODE>mode == DImode
 	   && INTVAL (operands[3]) > 32
-	   && INTVAL (operands[3]) + INTVAL (operands[4]) == 64))"
+	   && INTVAL (operands[3]) + INTVAL (operands[4]) == 64))
+   && ix86_match_ccmode (insn,
+			 /* *testdi_1 requires CCZmode if the mask has bit
+			    31 set and all bits above it clear.  */
+			 GET_MODE (operands[2]) == DImode
+			 && INTVAL (operands[3]) + INTVAL (operands[4]) == 32
+			 ? CCZmode : CCNOmode)"
   "#"
   "&& 1"
   [(set (match_dup 0) (match_op_dup 1 [(match_dup 2) (const_int 0)]))]
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index f91af78a302..5ed497dc44c 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2020-03-10  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/94088
+	* gcc.target/i386/pr94088.c: New test.
+
 2020-03-09  Marek Polacek  <polacek@redhat.com>
 
 	PR c++/92031 - bogus taking address of rvalue error.
diff --git a/gcc/testsuite/gcc.target/i386/pr94088.c b/gcc/testsuite/gcc.target/i386/pr94088.c
new file mode 100644
index 00000000000..d8cdba5280d
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr94088.c
@@ -0,0 +1,9 @@
+/* PR target/94088 */
+/* { dg-do compile } */
+/* { dg-options "-mtbm -O1 -fira-loop-pressure -fno-dce" } */
+
+double
+foo (int x)
+{
+  return x / (4294950402U % -65472 + 161);
+}